Silicon Labs EFM8UB1 Reference guide

Type
Reference guide
EFM8 Universal Bee Family
EFM8UB1 Reference Manual
The EFM8UB1, part of the Universal Bee family of MCUs, is a
multi-purpose line of 8-bit microcontrollers with USB feature set in
small packages.
These devices offer high value by integrating an innovative energy-smart USB peripheral
interface, charger detect circuit, 8 kV ESD protection, and enhanced high speed commu-
nication interfaces into small packages, making them ideal for space-constrained USB
applications. With an efficient 8051 core and precision analog, the EFM8UB1 family is
also optimal for embedded applications.
EFM8UB1 applications include the following:
KEY FEATURES
Pipelined 8-bit C8051 core with 50 MHz
maximum operating frequency
Up to 22 multifunction, 5 V tolerant I/O
pins
Low Energy USB with full- and low-speed
support saves up to 90% of the USB
energy
USB charger detect circuit (USB-BCS 1.2
compliant)
One 12-bit ADC and two analog
comparators with internal voltage DAC as
reference input
Five 16-bit timers
Two UARTs, SPI, SMBus/I2C master/
slave and I2C slave
Priority crossbar for flexible pin mapping
USB I/O controls, dongles
High-speed communication bridge
Consumer electronics
Medical equipment
SecurityI/O Ports
Core / Memory Clock Management
CIP-51 8051 Core
(50 MHz)
High Frequency
48 MHz RC
Oscillator
Energy Management
Internal LDO
Regulator
Brown-Out
Detector
Power-On Reset
8-bit SFR bus
Serial Interfaces Timers and Triggers Analog Interfaces
SPI
Pin Reset
Timer
0/1/2
PCA/PWM
Watchdog
Timer
ADC
Comparator 0
Internal
Voltage
Reference
16-bit CRC
Flash Program
Memory
(up to 16 KB)
RAM Memory
(2304 bytes)
Debug Interface
with C2
Lowest power mode with peripheral operational:
IdleNormal ShutdownSuspend Snooze
5 V-to 3.3 V LDO
Regulator
Timer 3/4
Comparator 1
USB
High Frequency
24.5 MHz RC
Oscillator
Pin Wakeup
External
Interrupts
General
Purpose I/O
I
2
C / SMBus
2 x UART
High-Speed I2C Slave
External CMOS
Oscillator
Low Frequency
RC Oscillator
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This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Table of Contents
1. System Overview .............................13
1.1 Introduction ...............................13
1.2 Power .................................14
1.3 I/O ..................................14
1.4 Clocking ................................15
1.5 Counters/Timers and PWM ..........................15
1.6 Communications and Other Digital Peripherals ...................16
1.7 Analog.................................19
1.8 Reset Sources ..............................20
1.9 Debugging ...............................20
1.10 Bootloader ...............................21
2. Memory ................................23
2.1 Memory Organization............................23
2.2 Program Memory .............................23
2.3 Data Memory ..............................23
2.4 Memory Map ..............................25
2.5 XRAM Control Registers...........................27
2.5.1 EMI0CN: External Memory Interface Control ..................27
3. Special Function Registers .........................28
3.1 Special Function Register Access .......................28
3.2 Special Function Register Memory Map .....................30
3.3 SFR Access Control Registers.........................37
3.3.1 SFRPAGE: SFR Page ..........................37
3.3.2 SFRPGCN: SFR Page Control .......................38
3.3.3 SFRSTACK: SFR Page Stack .......................38
4. Flash Memory ..............................39
4.1 Introduction ...............................39
4.2 Features ................................40
4.3 Functional Description ...........................41
4.3.1 Security Options ............................41
4.3.2 Programming the Flash Memory ......................42
4.3.3 Flash Write and Erase Precautions......................43
4.4 Flash Control Registers ...........................45
4.4.1 PSCTL: Program Store Control .......................45
4.4.2 FLKEY: Flash Lock and Key ........................46
5. Device Identification ...........................47
5.1 Device Identification ............................47
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5.2 Unique Identifier .............................47
5.3 Device Identification Registers.........................47
5.3.1 DEVICEID: Device Identification.......................47
5.3.2 DERIVID: Derivative Identification ......................48
5.3.3 REVID: Revision Identifcation .......................48
6. Interrupts ................................ 49
6.1 Introduction ...............................49
6.2 Interrupt Sources and Vectors .........................49
6.2.1 Interrupt Priorities ...........................49
6.2.2 Interrupt Latency ............................50
6.2.3 Interrupt Summary ...........................51
6.3 Interrupt Control Registers ..........................53
6.3.1 IE: Interrupt Enable ...........................53
6.3.2 IP: Interrupt Priority ...........................55
6.3.3 IPH: Interrupt Priority High ........................56
6.3.4 EIE1: Extended Interrupt Enable 1 ......................57
6.3.5 EIP1: Extended Interrupt Priority 1 Low ....................59
6.3.6 EIP1H: Extended Interrupt Priority 1 High ...................60
6.3.7 EIE2: Extended Interrupt Enable 2 ......................61
6.3.8 EIP2: Extended Interrupt Priority 2 ......................62
6.3.9 EIP2H: Extended Interrupt Priority 2 High ...................62
7. Power Management and Internal Regulators ..................63
7.1 Introduction ...............................63
7.2 Features ................................64
7.3 Idle Mode................................65
7.4 Stop Mode ...............................65
7.5 Suspend Mode ..............................65
7.6 Snooze Mode ..............................66
7.7 Shutdown Mode .............................66
7.8 5V-to-3.3V Regulator ............................66
7.9 Power Management Control Registers ......................67
7.9.1 PCON0: Power Control..........................67
7.9.2 PCON1: Power Control 1 .........................68
7.9.3 REG0CN: Voltage Regulator 0 Control ....................68
7.9.4 REG1CN: Voltage Regulator 1 Control ....................69
8. Clocking and Oscillators ..........................70
8.1 Introduction ...............................70
8.2 Features ................................70
8.3 Functional Description ...........................70
8.3.1 Clock Selection ............................70
8.3.2 HFOSC0 24.5 MHz Internal Oscillator .....................71
8.3.3 HFOSC1 48 MHz Internal Oscillator .....................71
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8.3.4 LFOSC0 80 kHz Internal Oscillator ......................71
8.3.5 External Clock.............................71
8.4 Clocking and Oscillator Control Registers .....................72
8.4.1 CLKSEL: Clock Select ..........................72
8.4.2 HFO0CAL: High Frequency Oscillator 0 Calibration ................73
8.4.3 HFO1CAL: High Frequency Oscillator 1 Calibration ................73
8.4.4 HFOCN: High Frequency Oscillator Control ...................74
8.4.5 LFO0CN: Low Frequency Oscillator Control...................75
9. Reset Sources and Power Supply Monitor ...................76
9.1 Introduction ...............................76
9.2 Features ................................76
9.3 Functional Description ...........................77
9.3.1 Device Reset .............................77
9.3.2 Power-On Reset ............................78
9.3.3 Supply Monitor Reset ..........................79
9.3.4 External Reset ............................79
9.3.5 Missing Clock Detector Reset .......................79
9.3.6 Comparator (CMP0) Reset ........................80
9.3.7 Watchdog Timer Reset ..........................80
9.3.8 Flash Error Reset ...........................80
9.3.9 Software Reset ............................80
9.3.10 USB Reset .............................80
9.4 Reset Sources and Supply Monitor Control Registers .................81
9.4.1 RSTSRC: Reset Source .........................81
9.4.2 VDM0CN: Supply Monitor Control ......................82
10. CIP-51 Microcontroller Core ........................83
10.1 Introduction ..............................83
10.2 Features ...............................84
10.3 Functional Description ...........................84
10.3.1 Programming and Debugging Support ....................84
10.3.2 Prefetch Engine............................84
10.3.3 Instruction Set ............................85
10.4 CPU Core Registers ...........................89
10.4.1 DPL: Data Pointer Low .........................89
10.4.2 DPH: Data Pointer High .........................89
10.4.3 SP: Stack Pointer ...........................89
10.4.4 ACC: Accumulator ...........................90
10.4.5 B: B Register.............................90
10.4.6 PSW: Program Status Word .......................91
10.4.7 PFE0CN: Prefetch Engine Control .....................92
11. Port I/O, Crossbar, External Interrupts, and Port Match ..............93
11.1 Introduction ..............................93
11.2 Features ...............................93
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11.3 Functional Description ...........................94
11.3.1 Port I/O Modes of Operation .......................94
11.3.2 Analog and Digital Functions .......................95
11.3.3 Priority Crossbar Decoder ........................97
11.3.4 INT0 and INT1 ...........................100
11.3.5 Port Match ............................100
11.3.6 Direct Port I/O Access (Read/Write) ....................100
11.4 Port I/O Control Registers .........................101
11.4.1 XBR0: Port I/O Crossbar 0 .......................101
11.4.2 XBR1: Port I/O Crossbar 1 .......................103
11.4.3 XBR2: Port I/O Crossbar 2 .......................104
11.4.4 PRTDRV: Port Drive Strength ......................105
11.4.5 P0MASK: Port 0 Mask ........................106
11.4.6 P0MAT: Port 0 Match .........................107
11.4.7 P0: Port 0 Pin Latch .........................108
11.4.8 P0MDIN: Port 0 Input Mode .......................109
11.4.9 P0MDOUT: Port 0 Output Mode .....................110
11.4.10 P0SKIP: Port 0 Skip .........................111
11.4.11 P1MASK: Port 1 Mask ........................112
11.4.12 P1MAT: Port 1 Match ........................113
11.4.13 P1: Port 1 Pin Latch .........................114
11.4.14 P1MDIN: Port 1 Input Mode ......................115
11.4.15 P1MDOUT: Port 1 Output Mode .....................116
11.4.16 P1SKIP: Port 1 Skip .........................117
11.4.17 P2MASK: Port 2 Mask ........................118
11.4.18 P2MAT: Port 2 Match ........................119
11.4.19 P2: Port 2 Pin Latch .........................120
11.4.20 P2MDIN: Port 2 Input Mode ......................121
11.4.21 P2MDOUT: Port 2 Output Mode .....................122
11.4.22 P2SKIP: Port 2 Skip .........................123
11.4.23 P3: Port 3 Pin Latch .........................123
11.4.24 P3MDIN: Port 3 Input Mode ......................124
11.4.25 P3MDOUT: Port 3 Output Mode .....................124
11.5 INT0 and INT1 Control Registers ......................125
11.5.1 IT01CF: INT0/INT1 Configuration .....................125
12. Analog-to-Digital Converter (ADC0) .....................127
12.1 Introduction .............................127
12.2 Features ..............................128
12.3 Functional Description ..........................128
12.3.1 Clocking .............................128
12.3.2 Voltage Reference Options .......................128
12.3.3 Input Selection ...........................129
12.3.4 Gain Setting ............................130
12.3.5 Initiating Conversions .........................130
12.3.6 Input Tracking ...........................130
12.3.7 Burst Mode ............................133
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12.3.8 8-Bit Mode ............................133
12.3.9 12-Bit Mode ............................134
12.3.10 Output Formatting .........................135
12.3.11 Power Considerations ........................136
12.3.12 Window Comparator .........................138
12.3.13 Temperature Sensor .........................140
12.4 ADC0 Control Registers .........................141
12.4.1 ADC0CN0: ADC0 Control 0 .......................141
12.4.2 ADC0CN1: ADC0 Control 1 .......................142
12.4.3 ADC0CF: ADC0 Configuration ......................143
12.4.4 ADC0AC: ADC0 Accumulator Configuration .................144
12.4.5 ADC0PWR: ADC0 Power Control .....................146
12.4.6 ADC0TK: ADC0 Burst Mode Track Time ..................147
12.4.7 ADC0H: ADC0 Data Word High Byte ...................147
12.4.8 ADC0L: ADC0 Data Word Low Byte ....................148
12.4.9 ADC0GTH: ADC0 Greater-Than High Byte .................148
12.4.10 ADC0GTL: ADC0 Greater-Than Low Byte .................148
12.4.11 ADC0LTH: ADC0 Less-Than High Byte ..................149
12.4.12 ADC0LTL: ADC0 Less-Than Low Byte ..................149
12.4.13 ADC0MX: ADC0 Multiplexer Selection ...................149
12.4.14 REF0CN: Voltage Reference Control ...................150
13. Comparators (CMP0 and CMP1) .......................151
13.1 Introduction .............................151
13.2 Features ..............................151
13.3 Functional Description ..........................151
13.3.1 Response Time and Supply Current ....................151
13.3.2 Hysteresis ............................152
13.3.3 Input Selection ...........................152
13.3.4 Output Routing ...........................158
13.4 CMP0 Control Registers .........................160
13.4.1 CMP0CN0: Comparator 0 Control 0 ....................160
13.4.2 CMP0MD: Comparator 0 Mode .....................162
13.4.3 CMP0MX: Comparator 0 Multiplexer Selection ................163
13.4.4 CMP0CN1: Comparator 0 Control 1 ....................164
13.5 CMP1 Control Registers .........................165
13.5.1 CMP1CN0: Comparator 1 Control 0 ....................165
13.5.2 CMP1MD: Comparator 1 Mode .....................167
13.5.3 CMP1MX: Comparator 1 Multiplexer Selection ................168
13.5.4 CMP1CN1: Comparator 1 Control 1 ....................169
14. Cyclic Redundancy Check (CRC0) ......................170
14.1 Introduction .............................170
14.2 Features ..............................170
14.3 Functional Description ..........................171
14.3.1 16-bit CRC Algorithm .........................171
14.3.2 Using the CRC on a Data Stream .....................172
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14.3.3 Using the CRC to Check Code Memory ...................172
14.3.4 Bit Reversal ............................172
14.4 CRC0 Control Registers .........................173
14.4.1 CRC0CN0: CRC0 Control 0.......................173
14.4.2 CRC0IN: CRC0 Data Input .......................173
14.4.3 CRC0DAT: CRC0 Data Output......................174
14.4.4 CRC0ST: CRC0 Automatic Flash Sector Start ................174
14.4.5 CRC0CNT: CRC0 Automatic Flash Sector Count ...............174
14.4.6 CRC0FLIP: CRC0 Bit Flip .......................175
14.4.7 CRC0CN1: CRC0 Control 1.......................175
15. I2C Slave (I2CSLAVE0) ..........................176
15.1 Introduction .............................176
15.2 Features ..............................176
15.3 Functional Description ..........................177
15.3.1 Overview .............................177
15.3.2 I2C Protocol ............................177
15.3.3 Automatic Address Recognition .....................180
15.3.4 Operational Modes ..........................181
15.3.5 Status Decoding ..........................186
15.4 I2C0 Slave Control Registers........................187
15.4.1 I2C0DIN: I2C0 Received Data ......................187
15.4.2 I2C0DOUT: I2C0 Transmit Data .....................187
15.4.3 I2C0SLAD: I2C0 Slave Address .....................187
15.4.4 I2C0STAT: I2C0 Status ........................188
15.4.5 I2C0CN0: I2C0 Control ........................189
15.4.6 I2C0FCN0: I2C0 FIFO Control 0 .....................191
15.4.7 I2C0FCN1: I2C0 FIFO Control 1 .....................192
15.4.8 I2C0FCT: I2C0 FIFO Count .......................193
16. Programmable Counter Array (PCA0) .....................194
16.1 Introduction .............................194
16.2 Features ..............................195
16.3 Functional Description ..........................195
16.3.1 Counter / Timer ...........................195
16.3.2 Interrupt Sources ..........................196
16.3.3 Capture/Compare Modules .......................196
16.3.4 Edge-Triggered Capture Mode ......................197
16.3.5 Software Timer (Compare) Mode .....................198
16.3.6 High-Speed Output Mode .......................199
16.3.7 Frequency Output Mode ........................200
16.3.8 PWM Waveform Generation ......................200
16.4 PCA0 Control Registers .........................207
16.4.1 PCA0CN0: PCA Control ........................207
16.4.2 PCA0MD: PCA Mode .........................208
16.4.3 PCA0PWM: PCA PWM Configuration ...................209
16.4.4 PCA0CLR: PCA Comparator Clear Control .................210
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16.4.5 PCA0L: PCA Counter/Timer Low Byte ...................210
16.4.6 PCA0H: PCA Counter/Timer High Byte ...................211
16.4.7 PCA0POL: PCA Output Polarity .....................211
16.4.8 PCA0CENT: PCA Center Alignment Enable .................212
16.4.9 PCA0CPM0: PCA Channel 0 Capture/Compare Mode ..............213
16.4.10 PCA0CPL0: PCA Channel 0 Capture Module Low Byte .............214
16.4.11 PCA0CPH0: PCA Channel 0 Capture Module High Byte ............214
16.4.12 PCA0CPM1: PCA Channel 1 Capture/Compare Mode .............215
16.4.13 PCA0CPL1: PCA Channel 1 Capture Module Low Byte .............216
16.4.14 PCA0CPH1: PCA Channel 1 Capture Module High Byte ............216
16.4.15 PCA0CPM2: PCA Channel 2 Capture/Compare Mode .............217
16.4.16 PCA0CPL2: PCA Channel 2 Capture Module Low Byte .............218
16.4.17 PCA0CPH2: PCA Channel 2 Capture Module High Byte ............218
17. Serial Peripheral Interface (SPI0) ......................219
17.1 Introduction .............................219
17.2 Features ..............................219
17.3 Functional Description ..........................220
17.3.1 Signals ..............................220
17.3.2 Master Mode Operation ........................221
17.3.3 Slave Mode Operation ........................221
17.3.4 Clock Phase and Polarity .......................222
17.3.5 Basic Data Transfer .........................223
17.3.6 Using the SPI FIFOs .........................223
17.3.7 SPI Timing Diagrams .........................226
17.4 SPI0 Control Registers ..........................230
17.4.1 SPI0CFG: SPI0 Configuration ......................230
17.4.2 SPI0CN0: SPI0 Control ........................232
17.4.3 SPI0CKR: SPI0 Clock Rate .......................233
17.4.4 SPI0DAT: SPI0 Data .........................233
17.4.5 SPI0FCN0: SPI0 FIFO Control 0 .....................234
17.4.6 SPI0FCN1: SPI0 FIFO Control 1 .....................236
17.4.7 SPI0FCT: SPI0 FIFO Count.......................237
18. System Management Bus / I2C (SMB0) ....................238
18.1 Introduction .............................238
18.2 Features ..............................238
18.3 Functional Description ..........................238
18.3.1 Supporting Documents ........................238
18.3.2 SMBus Protocol ...........................239
18.3.3 Configuring the SMBus Module .....................241
18.3.4 Operational Modes ..........................246
18.4 SMB0 Control Registers .........................254
18.4.1 SMB0CF: SMBus 0 Configuration .....................254
18.4.2 SMB0TC: SMBus 0 Timing and Pin Control .................255
18.4.3 SMB0CN0: SMBus 0 Control ......................256
18.4.4 SMB0ADR: SMBus 0 Slave Address ....................257
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18.4.5 SMB0ADM: SMBus 0 Slave Address Mask .................258
18.4.6 SMB0DAT: SMBus 0 Data .......................258
18.4.7 SMB0FCN0: SMBus 0 FIFO Control 0 ...................259
18.4.8 SMB0FCN1: SMBus 0 FIFO Control 1 ...................260
18.4.9 SMB0RXLN: SMBus 0 Receive Length Counter ................261
18.4.10 SMB0FCT: SMBus 0 FIFO Count ....................261
19. Timers (Timer0, Timer1, Timer2, Timer3, and Timer4) ...............262
19.1 Introduction .............................262
19.2 Features ..............................262
19.3 Functional Description ..........................263
19.3.1 System Connections .........................263
19.3.2 Timer 0 and Timer 1 .........................263
19.3.3 Timer 2, Timer 3, and Timer 4 ......................267
19.4 Timer 0, 1, 2, 3, and 4 Control Registers ....................272
19.4.1 CKCON0: Clock Control 0 .......................272
19.4.2 CKCON1: Clock Control 1 .......................273
19.4.3 TCON: Timer 0/1 Control .......................274
19.4.4 TMOD: Timer 0/1 Mode ........................275
19.4.5 TL0: Timer 0 Low Byte ........................276
19.4.6 TL1: Timer 1 Low Byte ........................276
19.4.7 TH0: Timer 0 High Byte ........................277
19.4.8 TH1: Timer 1 High Byte ........................277
19.4.9 TMR2CN0: Timer 2 Control 0 ......................278
19.4.10 TMR2RLL: Timer 2 Reload Low Byte ...................279
19.4.11 TMR2RLH: Timer 2 Reload High Byte ...................279
19.4.12 TMR2L: Timer 2 Low Byte .......................279
19.4.13 TMR2H: Timer 2 High Byte ......................280
19.4.14 TMR2CN1: Timer 2 Control 1 ......................280
19.4.15 TMR3RLL: Timer 3 Reload Low Byte ...................280
19.4.16 TMR3RLH: Timer 3 Reload High Byte ...................281
19.4.17 TMR3L: Timer 3 Low Byte .......................281
19.4.18 TMR3H: Timer 3 High Byte ......................281
19.4.19 TMR3CN0: Timer 3 Control 0 ......................282
19.4.20 TMR3CN1: Timer 3 Control 1 ......................283
19.4.21 TMR4RLL: Timer 4 Reload Low Byte ...................283
19.4.22 TMR4RLH: Timer 4 Reload High Byte ...................283
19.4.23 TMR4L: Timer 4 Low Byte .......................284
19.4.24 TMR4H: Timer 4 High Byte ......................284
19.4.25 TMR4CN0: Timer 4 Control 0 ......................285
19.4.26 TMR4CN1: Timer 4 Control 1 ......................286
20. Universal Asynchronous Receiver/Transmitter 0 (UART0) .............287
20.1 Introduction .............................287
20.2 Features ..............................287
20.3 Functional Description ..........................288
20.3.1 Baud Rate Generation ........................288
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20.3.2 Data Format ............................288
20.3.3 Data Transfer ...........................289
20.3.4 Multiprocessor Communications .....................289
20.4 UART0 Control Registers .........................290
20.4.1 SCON0: UART0 Serial Port Control ....................290
20.4.2 SBUF0: UART0 Serial Port Data Buffer ...................291
21. Universal Asynchronous Receiver/Transmitter 1 (UART1) .............292
21.1 Introduction .............................292
21.2 Features ..............................292
21.3 Functional Description ..........................293
21.3.1 Baud Rate Generation ........................293
21.3.2 Data Format ............................293
21.3.3 Flow Control ............................294
21.3.4 Basic Data Transfer .........................294
21.3.5 Data Transfer With FIFO ........................294
21.3.6 Multiprocessor Communications .....................297
21.3.7 LIN Break and Sync Detect .......................297
21.3.8 Autobaud Detection .........................297
21.4 UART1 Control Registers .........................298
21.4.1 SCON1: UART1 Serial Port Control ....................298
21.4.2 SMOD1: UART1 Mode ........................300
21.4.3 SBUF1: UART1 Serial Port Data Buffer ...................301
21.4.4 SBCON1: UART1 Baud Rate Generator Control ................302
21.4.5 SBRLH1: UART1 Baud Rate Generator High Byte ...............302
21.4.6 SBRLL1: UART1 Baud Rate Generator Low Byte ...............303
21.4.7 UART1FCN0: UART1 FIFO Control 0 ...................304
21.4.8 UART1FCN1: UART1 FIFO Control 1 ...................306
21.4.9 UART1FCT: UART1 FIFO Count .....................307
21.4.10 UART1LIN: UART1 LIN Configuration ...................308
22. Universal Serial Bus (USB0) ........................310
22.1 Introduction .............................310
22.2 Features ..............................310
22.3 Functional Description ..........................311
22.3.1 Endpoint Addressing .........................311
22.3.2 Transceiver Control .........................311
22.3.3 Clock Configuration .........................311
22.3.4 VBUS Control ...........................311
22.3.5 Register Access...........................312
22.3.6 FIFO Management ..........................314
22.3.7 Function Addressing .........................315
22.3.8 Function Configuration and Control ....................316
22.3.9 Interrupts .............................316
22.3.10 Serial Interface Engine ........................316
22.3.11 Endpoint 0 ............................317
22.3.12 Endpoints 1, 2, and 3 ........................318
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22.3.13 Low Energy Mode .........................320
22.3.14 Charger Detect Function .......................320
22.4 USB0 Control Registers .........................325
22.4.1 USB0XCN: USB0 Transceiver Control ...................325
22.4.2 USB0ADR: USB0 Indirect Address ....................326
22.4.3 USB0DAT: USB0 Data ........................327
22.4.4 INDEX: USB0 Endpoint Index ......................327
22.4.5 CLKREC: USB0 Clock Recovery Control ..................328
22.4.6 FIFO0: USB0 Endpoint 0 FIFO Access ...................329
22.4.7 FIFO1: USB0 Endpoint 1 FIFO Access ...................329
22.4.8 FIFO2: USB0 Endpoint 2 FIFO Access ...................329
22.4.9 FIFO3: USB0 Endpoint 3 FIFO Access ...................330
22.4.10 FADDR: USB0 Function Address ....................330
22.4.11 POWER: USB0 Power ........................331
22.4.12 FRAMEL: USB0 Frame Number Low ...................332
22.4.13 FRAMEH: USB0 Frame Number High ...................332
22.4.14 IN1INT: USB0 IN Endpoint Interrupt ...................333
22.4.15 OUT1INT: USB0 OUT Endpoint Interrupt ..................334
22.4.16 CMINT: USB0 Common Interrupt ....................335
22.4.17 IN1IE: USB0 IN Endpoint Interrupt Enable .................336
22.4.18 OUT1IE: USB0 OUT Endpoint Interrupt Enable ................337
22.4.19 CMIE: USB0 Common Interrupt Enable ..................338
22.4.20 E0CSR: USB0 Endpoint0 Control ....................339
22.4.21 E0CNT: USB0 Endpoint0 Data Count ...................340
22.4.22 EENABLE: USB0 Endpoint Enable ....................341
22.4.23 EINCSRL: USB0 IN Endpoint Control Low .................342
22.4.24 EINCSRH: USB0 IN Endpoint Control High .................343
22.4.25 EOUTCSRL: USB0 OUT Endpoint Control Low................344
22.4.26 EOUTCSRH: USB0 OUT Endpoint Control High ...............345
22.4.27 EOUTCNTL: USB0 OUT Endpoint Count Low ................345
22.4.28 EOUTCNTH: USB0 OUT Endpoint Count High ................346
22.4.29 USB0CF: USB0 Configuration .....................347
22.4.30 USB0AEC: USB0 Advanced Energy Control.................349
22.4.31 USB0CDCF: USB0 Charger Detect Configuration ...............350
22.4.32 USB0CDCN: USB0 Charger Detect Control .................351
22.4.33 USB0CDSTA: USB0 Charger Detect Status .................352
23. Watchdog Timer (WDT0)..........................354
23.1 Introduction .............................354
23.2 Features ..............................354
23.3 Using the Watchdog Timer ........................354
23.4 WDT0 Control Registers .........................356
23.4.1 WDTCN: Watchdog Timer Control ....................356
24. C2 Debug and Programming Interface ....................357
24.1 Introduction .............................357
24.2 Features ..............................357
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24.3 Pin Sharing .............................357
24.4 C2 Interface Registers ..........................358
24.4.1 C2ADD: C2 Address .........................358
24.4.2 C2DEVID: C2 Device ID ........................358
24.4.3 C2REVID: C2 Revision ID .......................358
24.4.4 C2FPCTL: C2 Flash Programming Control..................359
24.4.5 C2FPDAT: C2 Flash Programming Data ..................359
25. Revision History.............................360
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1. System Overview
1.1 Introduction
System Clock
Configuration
24.5 MHz 2%
Oscillator
CIP-51 8051 Controller
Core
16 KB ISP Flash
Program Memory
256 Byte SRAM
SFR
Bus
1024 Byte XRAM
SYSCLK
Independent
Watchdog
Timer
Power
Net
Voltage
Regulators
VDD
VREGIN
GND
CMOS Oscillator
Input
48 MHz 1.5%
Oscillator
Clock
Recovery
D+
D-
VBUS
USB Peripheral
Controller
1 KB RAM
Full / Low
Speed
Transceiver
Low Freq.
Oscillator
Charge
Detection
Low Power
EXTCLK
Power-On
Reset
Supply
Monitor
C2CK/RSTb
Reset
Debug /
Programming
Hardware
C2D
Analog Peripherals
Digital Peripherals
AMUX
Priority
Crossbar
Decoder
Crossbar Control
Port I/O Configuration
CRC
2 Comparators
12/10 bit
ADC
Temp
Sensor
VREFVDD
VDD
Internal
Reference
+
-
+
-
UART1
Timers 0,
1, 2, 3, 4
3-ch PCA
I2C /
SMBus
SPI
Port 0
Drivers
Port 1
Drivers
P0.n
Port 2
Drivers
P2.n
P1.n
Port 3
Drivers
P3.n
UART0
I2C Slave
Figure 1.1. Detailed EFM8UB1 Block Diagram
This section describes the EFM8UB1 family at a high level.
For more information on the device packages and pinout, electrical specifications, and typical connection diagrams, see the EFM8UB1
Data Sheet. For more information on each module including register definitions, see the EFM8UB1 Reference Manual. For more infor-
mation on any errata, see the EFM8UB1 Errata.
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1.2 Power
All internal circuitry draws power from the VDD supply pin. External I/O pins are powered from the VIO supply voltage (or VDD on devi-
ces without a separate VIO connection), while most of the internal circuitry is supplied by an on-chip LDO regulator. Control over the
device power can be achieved by enabling/disabling individual peripherals as needed. Each analog peripheral can be disabled when
not in use and placed in low power mode. Digital peripherals, such as timers and serial buses, have their clocks gated off and draw little
power when they are not in use.
Table 1.1. Power Modes
Power Mode Details Mode Entry Wake-Up Sources
Normal Core and all peripherals clocked and fully operational
Idle Core halted
All peripherals clocked and fully operational
Code resumes execution on wake event
Set IDLE bit in PCON0 Any interrupt
Suspend Core and peripheral clocks halted
HFOSC0 and HFOSC1 oscillators stopped
Regulators in normal bias mode for fast wake
Timer 3 and 4 may clock from LFOSC0
Code resumes execution on wake event
1. Switch SYSCLK to
HFOSC0
2. Set SUSPEND bit in
PCON1
USB0 Bus Activity
Timer 4 Event
SPI0 Activity
I2C0 Slave Activity
Port Match Event
Comparator 0 Falling
Edge
Stop All internal power nets shut down
5V regulator remains active (if enabled)
Internal 1.8 V LDO on
Pins retain state
Exit on any reset source
1. Clear STOPCF bit in
REG0CN
2. Set STOP bit in
PCON0
Any reset source
Snooze Core and peripheral clocks halted
HFOSC0 and HFOSC1 oscillators stopped
Regulators in low bias current mode for energy sav-
ings
Timer 3 and 4 may clock from LFOSC0
Code resumes execution on wake event
1. Switch SYSCLK to
HFOSC0
2. Set SNOOZE bit in
PCON1
USB0 Bus Activity
Timer 4 Event
SPI0 Activity
I2C0 Slave Activity
Port Match Event
Comparator 0 Falling
Edge
Shutdown All internal power nets shut down
5V regulator remains active (if enabled)
Internal 1.8 V LDO off to save energy
Pins retain state
Exit on pin or power-on reset
1. Set STOPCF bit in
REG0CN
2. Set STOP bit in
PCON0
RSTb pin reset
Power-on reset
1.3 I/O
Digital and analog resources are externally available on the device’s multi-purpose I/O pins. Port pins P0.0-P2.3 can be defined as gen-
eral-purpose I/O (GPIO), assigned to one of the internal digital resources through the crossbar or dedicated channels, or assigned to an
analog function. Port pins P3.0 and P3.1 can be used as GPIO. Additionally, the C2 Interface Data signal (C2D) is shared with P3.0.
The port control block offers the following features:
Up to 22 multi-functions I/O pins, supporting digital and analog functions.
Flexible priority crossbar decoder for digital peripheral assignment.
Two drive strength settings for each port.
Two direct-pin interrupt sources with dedicated interrupt vectors (INT0 and INT1).
Up to 20 direct-pin interrupt sources with shared interrupt vector (Port Match).
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System Overview
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1.4 Clocking
The CPU core and peripheral subsystem may be clocked by both internal and external oscillator resources. By default, the system
clock comes up running from the 24.5 MHz oscillator divided by 8.
The clock control system offers the following features:
Provides clock to core and peripherals.
24.5 MHz internal oscillator (HFOSC0), accurate to ±2% over supply and temperature corners.
48 MHz internal oscillator (HFOSC1), accurate to ±1.5% over supply and temperature corners.
80 kHz low-frequency oscillator (LFOSC0).
External CMOS clock input (EXTCLK).
Clock divider with eight settings for flexible clock scaling:
Divide the selected clock source by 1, 2, 4, 8, 16, 32, 64, or 128.
HFOSC0 and HFOSC1 include 1.5x pre-scalers for further flexibility.
1.5 Counters/Timers and PWM
Programmable Counter Array (PCA0)
The programmable counter array (PCA) provides multiple channels of enhanced timer and PWM functionality while requiring less CPU
intervention than standard counter/timers. The PCA consists of a dedicated 16-bit counter/timer and one 16-bit capture/compare mod-
ule for each channel. The counter/timer is driven by a programmable timebase that has flexible external and internal clocking options.
Each capture/compare module may be configured to operate independently in one of five modes: Edge-Triggered Capture, Software
Timer, High-Speed Output, Frequency Output, or Pulse-Width Modulated (PWM) Output. Each capture/compare module has its own
associated I/O line (CEXn) which is routed through the crossbar to port I/O when enabled.
16-bit time base
Programmable clock divisor and clock source selection
Up to three independently-configurable channels
8, 9, 10, 11 and 16-bit PWM modes (center or edge-aligned operation)
Output polarity control
Frequency output mode
Capture on rising, falling or any edge
Compare function for arbitrary waveform generation
Software timer (internal compare) mode
Can accept hardware “kill” signal from comparator 0
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Timers (Timer 0, Timer 1, Timer 2, Timer 3, and Timer 4)
Several counter/timers are included in the device: two are 16-bit counter/timers compatible with those found in the standard 8051, and
the rest are 16-bit auto-reload timers for timing peripherals or for general purpose use. These timers can be used to measure time inter-
vals, count external events and generate periodic interrupt requests. Timer 0 and Timer 1 are nearly identical and have four primary
modes of operation. The other timers offer both 16-bit and split 8-bit timer functionality with auto-reload and capture capabilities.
Timer 0 and Timer 1 include the following features:
Standard 8051 timers, supporting backwards-compatibility with firmware and hardware.
Clock sources include SYSCLK, SYSCLK divided by 12, 4, or 48, the External Clock divided by 8, or an external pin.
8-bit auto-reload counter/timer mode
13-bit counter/timer mode
16-bit counter/timer mode
Dual 8-bit counter/timer mode (Timer 0)
Timer 2, Timer 3 and Timer 4 are 16-bit timers including the following features:
Clock sources for all timers include SYSCLK, SYSCLK divided by 12, or the External Clock divided by 8.
LFOSC0 divided by 8 may be used to clock Timer 3 and Timer 4 in active or suspend/snooze power modes.
Timer 4 is a low-power wake source, and can be chained together with Timer 3.
16-bit auto-reload timer mode.
Dual 8-bit auto-reload timer mode.
External pin capture.
LFOSC0 capture.
Comparator 0 capture.
USB Start-of-Frame (SOF) capture.
Watchdog Timer (WDT0)
The device includes a programmable watchdog timer (WDT) running off the low-frequency oscillator. A WDT overflow forces the MCU
into the reset state. To prevent the reset, the WDT must be restarted by application software before overflow. If the system experiences
a software or hardware malfunction preventing the software from restarting the WDT, the WDT overflows and causes a reset. Following
a reset, the WDT is automatically enabled and running with the default maximum time interval. If needed, the WDT can be disabled by
system software or locked on to prevent accidental disabling. Once locked, the WDT cannot be disabled until the next system reset.
The state of the RST pin is unaffected by this reset.
The Watchdog Timer has the following features:
Programmable timeout interval
Runs from the low-frequency oscillator
Lock-out feature to prevent any modification until a system reset
1.6 Communications and Other Digital Peripherals
Universal Serial Bus (USB0)
The USB0 peripheral provides a full-speed USB 2.0 compliant device controller and PHY with additional Low Energy USB features. The
device supports both full-speed (12MBit/s) and low speed (1.5MBit/s) operation, and includes a dedicated USB oscillator with clock re-
covery mechanism for crystal-free operation. No external components are required. The USB function controller (USB0) consists of a
Serial Interface Engine (SIE), USB transceiver (including matching resistors and configurable pull-up resistors), and 1 KB FIFO block.
The Low Energy Mode ensures the current consumption is optimized and enables USB communication on a strict power budget.
The USB0 module includes the following features:
Full and Low Speed functionality.
Implements 4 bidirectional endpoints.
Low Energy Mode to reduce active supply current based on bus bandwidth.
USB 2.0 compliant USB peripheral support (no host capability).
Direct module access to 1 KB of RAM for FIFO memory.
Clock recovery to meet USB clocking requirements with no external components.
Charger detection circuitry with automatic detection of SDP, CDP, and DCP interfaces.
D+ and D- can be routed to ADC input to support ACM and proprietary charger architectures.
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Universal Asynchronous Receiver/Transmitter (UART0)
UART0 is an asynchronous, full duplex serial port offering modes 1 and 3 of the standard 8051 UART. Enhanced baud rate support
allows a wide range of clock sources to generate standard baud rates. Received data buffering allows UART0 to start reception of a
second incoming data byte before software has finished reading the previous data byte.
The UART module provides the following features:
Asynchronous transmissions and receptions.
Baud rates up to SYSCLK/2 (transmit) or SYSCLK/8 (receive).
8- or 9-bit data.
Automatic start and stop generation.
Single-byte FIFO on transmit and receive.
Universal Asynchronous Receiver/Transmitter (UART1)
UART1 is an asynchronous, full duplex serial port offering a variety of data formatting options. A dedicated baud rate generator with a
16-bit timer and selectable prescaler is included, which can generate a wide range of baud rates. A received data FIFO allows UART1
to receive multiple bytes before data is lost and an overflow occurs.
UART1 provides the following features:
Asynchronous transmissions and receptions.
Dedicated baud rate generator supports baud rates up to SYSCLK/2 (transmit) or SYSCLK/8 (receive).
5, 6, 7, 8, or 9 bit data.
Automatic start and stop generation.
Automatic parity generation and checking.
Four byte FIFO on transmit and receive.
Auto-baud detection.
LIN break and sync field detection.
CTS / RTS hardware flow control.
Serial Peripheral Interface (SPI0)
The serial peripheral interface (SPI) module provides access to a flexible, full-duplex synchronous serial bus. The SPI can operate as a
master or slave device in both 3-wire or 4-wire modes, and supports multiple masters and slaves on a single SPI bus. The slave-select
(NSS) signal can be configured as an input to select the SPI in slave mode, or to disable master mode operation in a multi-master
environment, avoiding contention on the SPI bus when more than one master attempts simultaneous data transfers. NSS can also be
configured as a firmware-controlled chip-select output in master mode, or disabled to reduce the number of pins required. Additional
general purpose port I/O pins can be used to select multiple slave devices in master mode.
Supports 3- or 4-wire master or slave modes.
Supports external clock frequencies up to 12 Mbps in master or slave mode.
Support for all clock phase and polarity modes.
8-bit programmable clock rate (master).
Programmable receive timeout (slave).
Four byte FIFO on transmit and receive.
Can operate in suspend or snooze modes and wake the CPU on reception of a byte.
Support for multiple masters on the same data lines.
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System Management Bus / I2C (SMB0)
The SMBus I/O interface is a two-wire, bi-directional serial bus. The SMBus is compliant with the System Management Bus Specifica-
tion, version 1.1, and compatible with the I
2
C serial bus.
The SMBus module includes the following features:
Standard (up to 100 kbps) and Fast (400 kbps) transfer speeds
Support for master, slave, and multi-master modes
Hardware synchronization and arbitration for multi-master mode
Clock low extending (clock stretching) to interface with faster masters
Hardware support for 7-bit slave and general call address recognition
Firmware support for 10-bit slave address decoding
Ability to inhibit all slave states
Programmable data setup/hold times
Transmit and receive FIFOs (one byte) to help increase throughput in faster applications
I2C Slave (I2CSLAVE0)
The I2C Slave interface is a 2-wire, bidirectional serial bus that is compatible with the I2C Bus Specification 3.0. It is capable of transfer-
ring in high-speed mode (HS-mode) at speeds of up to 3.4 Mbps. Firmware can write to the I2C interface, and the I2C interface can
autonomously control the serial transfer of data. The interface also supports clock stretching for cases where the core may be tempora-
rily prohibited from transmitting a byte or processing a received byte during an I2C transaction. This module operates only as an I2C
slave device.
The I2C module includes the following features:
Standard (up to 100 kbps), Fast (400 kbps), Fast Plus (1 Mbps), and High-speed (3.4 Mbps) transfer speeds
Support for slave mode only
Clock low extending (clock stretching) to interface with faster masters
Hardware support for 7-bit slave address recognition
Transmit and receive FIFOs (two bytes) to help increase throughput in faster applications
16-bit CRC (CRC0)
The cyclic redundancy check (CRC) module performs a CRC using a 16-bit polynomial. CRC0 accepts a stream of 8-bit data and posts
the 16-bit result to an internal register. In addition to using the CRC block for data manipulation, hardware can automatically CRC the
flash contents of the device.
The CRC module is designed to provide hardware calculations for flash memory verification and communications protocols. The CRC
module supports the standard CCITT-16 16-bit polynomial (0x1021), and includes the following features:
Support for CCITT-16 polynomial
Byte-level bit reversal
Automatic CRC of flash contents on one or more 256-byte blocks
Initial seed selection of 0x0000 or 0xFFFF
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System Overview
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1.7 Analog
12-Bit Analog-to-Digital Converter (ADC0)
The ADC is a successive-approximation-register (SAR) ADC with 12-, 10-, and 8-bit modes, integrated track-and hold and a program-
mable window detector. The ADC is fully configurable under software control via several registers. The ADC may be configured to
measure different signals using the analog multiplexer. The voltage reference for the ADC is selectable between internal and external
reference sources.
Up to 20 external inputs.
Single-ended 12-bit and 10-bit modes.
Supports an output update rate of 200 ksps samples per second in 12-bit mode or 800 ksps samples per second in 10-bit mode.
Operation in low power modes at lower conversion speeds.
Asynchronous hardware conversion trigger, selectable between software, external I/O and internal timer sources.
Output data window comparator allows automatic range checking.
Support for burst mode, which produces one set of accumulated data per conversion-start trigger with programmable power-on set-
tling and tracking time.
Conversion complete and window compare interrupts supported.
Flexible output data formatting.
Includes an internal fast-settling reference with two levels (1.65 V and 2.4 V) and support for external reference and signal ground.
Integrated temperature sensor.
Low Current Comparators (CMP0, CMP1)
Analog comparators are used to compare the voltage of two analog inputs, with a digital output indicating which input voltage is higher.
External input connections to device I/O pins and internal connections are available through separate multiplexers on the positive and
negative inputs. Hysteresis, response time, and current consumption may be programmed to suit the specific needs of the application.
The comparator includes the following features:
Up to 10 (CMP0) or 12 (CMP1) external positive inputs
Up to 10 (CMP0) or 12 (CMP1) external negative inputs
Additional input options:
Internal connection to LDO output
Direct connection to GND
Direct connection to VDD
Dedicated 6-bit reference DAC
Synchronous and asynchronous outputs can be routed to pins via crossbar
Programmable hysteresis between 0 and ±20 mV
Programmable response time
Interrupts generated on rising, falling, or both edges
PWM output kill feature
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System Overview
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1.8 Reset Sources
Reset circuitry allows the controller to be easily placed in a predefined default condition. On entry to this reset state, the following occur:
The core halts program execution.
Module registers are initialized to their defined reset values unless the bits reset only with a power-on reset.
External port pins are forced to a known state.
Interrupts and timers are disabled.
All registers are reset to the predefined values noted in the register descriptions unless the bits only reset with a power-on reset. The
contents of RAM are unaffected during a reset; any previously stored data is preserved as long as power is not lost. The Port I/O latch-
es are reset to 1 in open-drain mode. Weak pullups are enabled during and after the reset. For Supply Monitor and power-on resets,
the RSTb pin is driven low until the device exits the reset state. On exit from the reset state, the program counter (PC) is reset, and the
system clock defaults to an internal oscillator. The Watchdog Timer is enabled, and program execution begins at location 0x0000.
Reset sources on the device include:
Power-on reset
External reset pin
Comparator reset
Software-triggered reset
Supply monitor reset (monitors VDD supply)
Watchdog timer reset
Missing clock detector reset
Flash error reset
USB reset
1.9 Debugging
The EFM8UB1 devices include an on-chip Silicon Labs 2-Wire (C2) debug interface to allow flash programming and in-system debug-
ging with the production part installed in the end application. The C2 interface uses a clock signal (C2CK) and a bi-directional C2 data
signal (C2D) to transfer information between the device and a host system. See the C2 Interface Specification for details on the C2
protocol.
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Silicon Labs EFM8UB1 Reference guide

Type
Reference guide

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