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NXP RS08KA Reference guide

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RS08
Microcontrollers
freescale.com
MC9RS08KA8
MC9RS08KA4
Reference Manual
MC9RS08KA8RM
Rev. 4
5/2015
Related Documentation:
• MC9RS08KA8 (Data Sheet)
Contains pin assignments and diagrams, all electrical
specifications, and mechanical drawing outlines.
Find the most current versions of all documents at:
http://www.freescale.com
8-Bit RS08 Central Processor Unit (CPU)
• Up to 20 MHz CPU at 1.8 V to 5.5 V across
temperature range of –40°C to 85°C
• Subset of HC08 instruction set with added
BGND instruction
On-Chip Memory
• 8 KB flash read/program/erase over full
operating voltage and temperature
— KA4 has 4 KB flash
• 254 byte random-access memory (RAM)
— KA4 has 126 byte RAM
• Security circuitry to prevent unauthorized
access to RAM and flash contents
Power-Saving Modes
• Wait and stop
• Wakeup from power-saving modes using
real-time interrupt (RTI), KBI, or ACMP
Clock Source Options
• Oscillator (XOSC) — Loop-Control Pierce
oscillator; crystal or ceramic resonator
range of 31.25 kHz to 39.0625 kHz or
1 MHz to 5 MHz
• Internal Clock Source (ICS) — Internal
clock source module containing a
frequency-locked-loop (FLL) controlled by
internal or external reference; precision
trimming of internal reference allows 0.2%
resolution and 2% deviation over
temperature and voltage; supports bus
frequencies up to 10 MHz
System Protection
• Watchdog computer operating properly
(COP) reset with option to run from
dedicated 1 kHz internal clock source or
bus clock
• Low-Voltage detection with reset or
interrupt
• Illegal opcode detection with reset
• Illegal address detection with reset
• Flash-Block protection
Development Support
• Single-Wire background debug interface
• Breakpoint capability to allow single
breakpoint setting during in-circuit
debugging
Peripherals
• ADC — 12-channel, 10-bit resolution;
2.5 μs conversion time; automatic compare
function; operation in stop; fully functional
from 2.7 V to 5.5 V (8-channels available
on 16-pin package)
• TPM — One 2-channel; selectable input
capture, output compare, or buffered edge-
or center-aligned PWM on each channel
• IIC — Inter-Integrated circuit bus module
capable of operation up to 100 kbps with
maximum bus loading; capable of higher
baudrates with reduced loading
• MTIM1 and MTIM2 — Two 8-bit modulo
timers
• KBI — Keyboard interrupts with rising or
falling edge detect; eight KBI ports in
16-pin and 20-pin packages
•ACMP — Analog comparator; full
rail-to-rail supply operation; option to
compare to fixed internal bandgap
reference voltage; can operate in stop mode
Input/Output
• 14/18 GPIOs including one output only pin
and one input only pin
• Hysteresis and configurable pullup device
on all input pins; configurable slew rate and
drive strength on all output pins
Package Options
• 16-pin SOIC, PDIP or TSSOP
• 20-pin SOIC or PDIP
MC9RS08KA8 Features
MC9RS08KA8 Series Reference Manual
Covers: MC9RS08KA8
MC9RS08KA4
MC9RS08KA8
Rev. 4
5/2015
MC9RS08KA8 Series Reference Manual, Rev. 4
6 Freescale Semiconductor
Revision History
To provide the most up-to-date information, the revision of our documents on the World Wide Web will
be the most current. Your printed copy may be an earlier revision. To verify you have the latest information
available, refer to:
http://freescale.com
The following revision history table summarizes changes contained in this document.
Revision
Number
Revision
Date
Description of Changes
Rev. 1 1/2008 Initial public release
Rev. 2 3/2008 Removed ICSLCLK signal in Figure 11-2.
Rev. 3 9/2008 Revised Figure 1-2.
Added 16-pin TSSOP package information.
Rev.4 5/2015 Updated Figure 11-2.
This product incorporates SuperFlash
®
technology licensed from SST.
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc.
© Freescale Semiconductor, Inc., 2008-2015. All rights reserved.
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 7
List of Chapters
Chapter Number Title Page
Chapter 1 MC9RS08KA8 Device Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Chapter 2 Pins and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Chapter 3 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 4 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Chapter 5 Resets, Interrupts, and General System Control . . . . . . . . . . . . . 41
Chapter 6 Parallel Input/Output Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Chapter 7 Keyboard Interrupt (RS08KBIV1) . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Chapter 8 Central Processor Unit (RS08CPUV1) . . . . . . . . . . . . . . . . . . . . . . 69
Chapter 9 Analog Comparator (RS08ACMPV1) . . . . . . . . . . . . . . . . . . . . . . .87
Chapter 10 10-bit Analog-to-Digital Converter (RS08ADC10V1). . . . . . . . . . 93
Chapter 11 Internal Clock Source (RS08ICSOSCV1) . . . . . . . . . . . . . . . . . .119
Chapter 12 Inter-Integrated Circuit (RS08IICV2). . . . . . . . . . . . . . . . . . . . . .131
Chapter 13 Modulo Timer (RS08MTIMV1) . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Chapter 14 16-Bit Timer/PWM (RS08TPMV2) . . . . . . . . . . . . . . . . . . . . . . . .161
Chapter 15 Development Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 9
Contents
Section Number Title Page
Chapter 1
MC9RS08KA8 Device Overview
1.1 Overview .........................................................................................................................................17
1.2 MCU Block Diagram ......................................................................................................................17
1.3 System Clock Distribution ..............................................................................................................19
Chapter 2
Pins and Connections
2.1 Introduction .....................................................................................................................................21
2.2 Device Pin Assignment ...................................................................................................................21
2.3 Recommended System Connections ...............................................................................................22
2.4 Pin Detail .........................................................................................................................................22
2.4.1 Power Pins ........................................................................................................................22
2.4.2 PTA5/TCLK/RESET/V
PP
Pin ...........................................................................................23
2.4.3 PTA4/ACMPO/BKGD/MS Pin ........................................................................................23
2.4.4 General-Purpose I/O and Peripheral Ports ........................................................................23
Chapter 3
Modes of Operation
3.1 Introduction .....................................................................................................................................25
3.2 Features ...........................................................................................................................................25
3.3 Run Mode ........................................................................................................................................25
3.4 Active Background Mode ...............................................................................................................25
3.5 Wait Mode .......................................................................................................................................26
3.6 Stop Mode .......................................................................................................................................27
3.6.1 Active BDM Enabled in Stop Mode .................................................................................28
3.6.2 LVD Enabled in Stop Mode ..............................................................................................28
Chapter 4
Memory
4.1 Memory Map ...................................................................................................................................29
4.2 Unimplemented Memory ................................................................................................................30
4.3 Indexed/Indirect Addressing ...........................................................................................................30
4.4 RAM and Register Addresses and Bit Assignments .......................................................................31
4.5 RAM ................................................................................................................................................34
4.6 Flash ................................................................................................................................................35
4.6.1 Features .............................................................................................................................35
4.6.2 Flash Programming Procedure ..........................................................................................35
4.6.3 Flash Mass Erase Operation .............................................................................................36
MC9RS08KA8 Series Reference Manual, Rev. 4
10 Freescale Semiconductor
4.6.4 Security .............................................................................................................................36
4.7 Flash Registers and Control Bits .....................................................................................................37
4.7.1 Flash Options Register (FOPT and NVOPT) ....................................................................37
4.7.2 Flash Control Register (FLCR) .........................................................................................38
4.8 Page Select Register (PAGESEL) ...................................................................................................38
Chapter 5
Resets, Interrupts, and General System Control
5.1 Introduction .....................................................................................................................................41
5.2 Features ...........................................................................................................................................41
5.3 MCU Reset ......................................................................................................................................41
5.4 Computer Operating Properly (COP) Watchdog .............................................................................42
5.5 Interrupts .........................................................................................................................................42
5.6 Low-Voltage Detect (LVD) System ................................................................................................43
5.6.1 Power-On Reset Operation ...............................................................................................43
5.6.2 LVD Reset Operation ........................................................................................................43
5.6.3 LVD Interrupt Operation ...................................................................................................43
5.7 Real-Time Interrupt (RTI) ...............................................................................................................43
5.8 Reset, Interrupt, and System Control Registers and Control Bits ...................................................44
5.8.1 System Reset Status Register (SRS) .................................................................................44
5.8.2 System Options Register (SOPT) .....................................................................................45
5.8.3 System Device Identification Register (SDIDH, SDIDL) ................................................46
5.8.4 System Real-Time Interrupt Status and Control Register (SRTISC) ................................47
5.8.5 System Power Management Status and Control 1 Register (SPMSC1) ...........................49
5.8.6 System Interrupt Pending Register (SIP1) ........................................................................49
Chapter 6
Parallel Input/Output Control
6.1 Pin Behavior in Low-Power Modes ................................................................................................52
6.2 Parallel I/O Registers ......................................................................................................................52
6.2.1 Port A Registers ................................................................................................................52
6.2.2 Port B Registers ................................................................................................................53
6.2.3 Port C Registers ................................................................................................................54
6.3 Pin Control Registers ......................................................................................................................55
6.3.1 Port A Pin Control Registers ............................................................................................55
6.3.2 Port B Pin Control Registers .............................................................................................57
6.3.3 Port C Pin Control Registers .............................................................................................59
Chapter 7
Keyboard Interrupt (RS08KBIV1)
7.1 Introduction .....................................................................................................................................63
7.1.1 Features .............................................................................................................................63
7.1.2 Modes of Operation ..........................................................................................................63
7.1.3 Block Diagram ..................................................................................................................63
7.2 External Signal Description ............................................................................................................64
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 11
7.3 Register Definition ..........................................................................................................................64
7.3.1 KBI Status and Control Register (KBISC) .......................................................................65
7.3.2 KBI Pin Enable Register (KBIPE) ....................................................................................65
7.3.3 KBI Edge Select Register (KBIES) ..................................................................................66
7.4 Functional Description ....................................................................................................................66
7.4.1 Edge Only Sensitivity .......................................................................................................66
7.4.2 Edge and Level Sensitivity ...............................................................................................67
7.4.3 KBI Pullup/Pulldown Resistors ........................................................................................67
7.4.4 KBI Initialization ..............................................................................................................67
Chapter 8
Central Processor Unit (RS08CPUV1)
8.1 Introduction .....................................................................................................................................69
8.2 Programmer’s Model and CPU Registers .......................................................................................69
8.2.1 Accumulator (A) ...............................................................................................................70
8.2.2 Program Counter (PC) ......................................................................................................71
8.2.3 Shadow Program Counter (SPC) ......................................................................................71
8.2.4 Condition Code Register (CCR) .......................................................................................71
8.2.5 Indexed Data Register (D[X]) ...........................................................................................72
8.2.6 Index Register (X) ............................................................................................................72
8.2.7 Page Select Register (PAGESEL) .....................................................................................73
8.3 Addressing Modes ...........................................................................................................................73
8.3.1 Inherent Addressing Mode (INH) .....................................................................................73
8.3.2 Relative Addressing Mode (REL) ....................................................................................73
8.3.3 Immediate Addressing Mode (IMM) ................................................................................74
8.3.4 Tiny Addressing Mode (TNY) ..........................................................................................74
8.3.5 Short Addressing Mode (SRT) .........................................................................................75
8.3.6 Direct Addressing Mode (DIR) ........................................................................................75
8.3.7 Extended Addressing Mode (EXT) ..................................................................................75
8.3.8 Indexed Addressing Mode (IX, Implemented by Pseudo Instructions) ............................75
8.4 Special Operations ...........................................................................................................................75
8.4.1 Reset Sequence .................................................................................................................76
8.4.2 Interrupts ...........................................................................................................................76
8.4.3 Wait and Stop Mode ..........................................................................................................76
8.4.4 Active Background Mode .................................................................................................76
8.5 Summary Instruction Table .............................................................................................................77
Chapter 9
Analog Comparator (RS08ACMPV1)
9.1 Introduction .....................................................................................................................................87
9.1.1 Features .............................................................................................................................88
9.1.2 Modes of Operation ..........................................................................................................88
9.1.3 Block Diagram ..................................................................................................................88
9.2 External Signal Description ............................................................................................................89
9.3 Register Definition ..........................................................................................................................89
MC9RS08KA8 Series Reference Manual, Rev. 4
12 Freescale Semiconductor
9.3.1 ACMP Status and Control Register (ACMPSC) ..............................................................90
9.4 Functional Description ....................................................................................................................90
Chapter 10
10-bit Analog-to-Digital Converter (RS08ADC10V1)
10.1 Introduction .....................................................................................................................................93
10.1.1 Module Configurations .....................................................................................................94
10.1.2 Features .............................................................................................................................96
10.1.3 Block Diagram ..................................................................................................................96
10.2 External Signal Description ............................................................................................................97
10.2.1 Analog Power (V
DDAD
) ....................................................................................................98
10.2.2 Analog Ground (V
SSAD
) ...................................................................................................98
10.2.3 Voltage Reference High (V
REFH
) .....................................................................................98
10.2.4 Voltage Reference Low (V
REFL
) ......................................................................................98
10.2.5 Analog Channel Inputs (ADx) ..........................................................................................98
10.3 Register Definition ..........................................................................................................................98
10.3.1 Status and Control Register 1 (ADCSC1) ........................................................................98
10.3.2 Status and Control Register 2 (ADCSC2) ......................................................................100
10.3.3 Data Result High Register (ADCRH) .............................................................................101
10.3.4 Data Result Low Register (ADCRL) ..............................................................................101
10.3.5 Compare Value High Register (ADCCVH) ....................................................................101
10.3.6 Compare Value Low Register (ADCCVL) .....................................................................102
10.3.7 Configuration Register (ADCCFG) ................................................................................102
10.3.8 Pin Control 1 Register (APCTL1) ..................................................................................104
10.3.9 Pin Control 2 Register (APCTL2) ..................................................................................104
10.3.10Pin Control 3 Register (APCTL3) ..................................................................................105
10.4 Functional Description ..................................................................................................................106
10.4.1 Clock Select and Divide Control ....................................................................................107
10.4.2 Input Select and Pin Control ...........................................................................................107
10.4.3 Hardware Trigger ............................................................................................................107
10.4.4 Conversion Control .........................................................................................................107
10.4.5 Automatic Compare Function .........................................................................................110
10.4.6 MCU Wait Mode Operation ............................................................................................110
10.4.7 MCU Stop Mode Operation ............................................................................................111
10.5 Initialization Information ..............................................................................................................111
10.5.1 ADC Module Initialization Example .............................................................................112
10.6 Application Information ................................................................................................................113
10.6.1 External Pins and Routing ..............................................................................................114
10.6.2 Sources of Error ..............................................................................................................115
Chapter 11
Internal Clock Source (RS08ICSOSCV1)
11.1 Introduction ...................................................................................................................................119
11.1.1 Features ...........................................................................................................................121
11.1.2 Modes of Operation ........................................................................................................121
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 13
11.1.3 Block Diagram ................................................................................................................122
11.2 External Signal Description ..........................................................................................................123
11.3 Register Definition ........................................................................................................................123
11.3.1 ICS Control Register 1 (ICSC1) .....................................................................................123
11.3.2 ICS Control Register 2 (ICSC2) .....................................................................................125
11.3.3 ICS Trim Register (ICSTRM) .........................................................................................126
11.3.4 ICS Status and Control (ICSSC) .....................................................................................126
11.4 Functional Description ..................................................................................................................127
11.4.1 Operational Modes ..........................................................................................................127
11.4.2 Mode Switching ..............................................................................................................129
11.4.3 Bus Frequency Divider ...................................................................................................129
11.4.4 Low Power Bit Usage .....................................................................................................129
11.4.5 Internal Reference Clock ................................................................................................130
11.4.6 Optional External Reference Clock ................................................................................130
11.4.7 Fixed Frequency Clock ...................................................................................................130
Chapter 12
Inter-Integrated Circuit (RS08IICV2)
12.1 Introduction ...................................................................................................................................131
12.1.1 Module Configuration .....................................................................................................131
12.1.2 Features ...........................................................................................................................133
12.1.3 Modes of Operation ........................................................................................................133
12.1.4 Block Diagram ................................................................................................................133
12.2 External Signal Description ..........................................................................................................134
12.2.1 SCL — Serial Clock Line ...............................................................................................134
12.2.2 SDA — Serial Data Line ................................................................................................134
12.3 Register Definition ........................................................................................................................135
12.3.1 IIC Address Register (IICA) ...........................................................................................135
12.3.2 IIC Frequency Divider Register (IICF) ..........................................................................135
12.3.3 IIC Control Register (IICC1) ..........................................................................................138
12.3.4 IIC Status Register (IICS) ...............................................................................................139
12.3.5 IIC Data I/O Register (IICD) ..........................................................................................140
12.3.6 IIC Control Register 2 (IICC2) .......................................................................................141
12.4 Functional Description ..................................................................................................................142
12.4.1 IIC Protocol .....................................................................................................................142
12.4.2 10-bit Address .................................................................................................................146
12.4.3 General Call Address ......................................................................................................147
12.5 Resets ............................................................................................................................................147
12.6 Interrupts .......................................................................................................................................147
12.6.1 Byte Transfer Interrupt ....................................................................................................147
12.6.2 Address Detect Interrupt .................................................................................................147
12.6.3 Arbitration Lost Interrupt ................................................................................................147
12.7 Initialization/Application Information ..........................................................................................149
MC9RS08KA8 Series Reference Manual, Rev. 4
14 Freescale Semiconductor
Chapter 13
Modulo Timer (RS08MTIMV1)
13.1 Introduction ...................................................................................................................................151
13.1.1 Features ...........................................................................................................................153
13.1.2 Modes of Operation ........................................................................................................153
13.1.3 Block Diagram ................................................................................................................154
13.2 External Signal Description ..........................................................................................................154
13.3 Register Definition ........................................................................................................................154
13.3.1 MTIM Status and Control Register (MTIMSC) .............................................................155
13.3.2 MTIM Clock Configuration Register (MTIMCLK) .......................................................156
13.3.3 MTIM Counter Register (MTIMCNT) ...........................................................................156
13.3.4 MTIM Modulo Register (MTIMMOD) ..........................................................................157
13.4 Functional Description ..................................................................................................................158
13.4.1 MTIM Operation Example .............................................................................................159
Chapter 14
16-Bit Timer/PWM (RS08TPMV2)
14.1 Introduction ...................................................................................................................................161
14.1.1 Features ...........................................................................................................................163
14.1.2 Block Diagram ................................................................................................................163
14.2 External Signal Description ..........................................................................................................165
14.2.1 External TPM Clock Sources .........................................................................................165
14.2.2 TPMxCHn — TPMx Channel n I/O Pins .......................................................................165
14.3 Register Definition ........................................................................................................................165
14.3.1 Timer Status and Control Register (TPMxSC) ...............................................................166
14.3.2 Timer Counter Registers (TPMxCNTH:TPMxCNTL) ...................................................167
14.3.3 Timer Counter Modulo Registers (TPMxMODH:TPMxMODL) ..................................168
14.3.4 Timer Channel n Status and Control Register (TPMxCnSC) .........................................169
14.3.5 Timer Channel Value Registers (TPMxCnVH:TPMxCnVL) .........................................170
14.4 Functional Description ..................................................................................................................171
14.4.1 Counter ............................................................................................................................171
14.4.2 Channel Mode Selection .................................................................................................172
14.4.3 Center-Aligned PWM Mode ...........................................................................................174
14.5 TPM Interrupts ..............................................................................................................................175
14.5.1 Clearing Timer Interrupt Flags .......................................................................................175
14.5.2 Timer Overflow Interrupt Description ............................................................................175
14.5.3 Channel Event Interrupt Description ..............................................................................176
14.5.4 PWM End-of-Duty-Cycle Events ...................................................................................176
Chapter 15
Development Support
15.1 Introduction ...................................................................................................................................177
15.2 Features .........................................................................................................................................177
15.3 RS08 Background Debug Controller (BDC) ................................................................................178
15.3.1 BKGD Pin Description ...................................................................................................179
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 15
15.3.2 Communication Details ..................................................................................................179
15.3.3 SYNC and Serial Communication Timeout ....................................................................182
15.4 BDC Registers and Control Bits ...................................................................................................183
15.4.1 BDC Status and Control Register (BDCSCR) ................................................................183
15.4.2 BDC Breakpoint Match Register ....................................................................................184
15.5 RS08 BDC Commands ..................................................................................................................185
MC9RS08KA8 Series Reference Manual, Rev. 4
16 Freescale Semiconductor
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 17
Chapter 1
MC9RS08KA8 Device Overview
1.1 Overview
The MC9RS08KA8 series microcontroller unit (MCU) is an extremely low-cost, small pin count, high
performance device intended for home appliances, medical equipment, and as a general purpose
microcontroller. This device is composed of standard on-chip modules including a very small and highly
efficient RS08 CPU core, 254 bytes RAM, 8K bytes flash, two 8-bit modulo timers,12-channel 10-bit
ADC, 2-channel 16-bit Timer/PWM, inter-integrated circuit bus module, keyboard interrupt, and analog
comparator. The device is available in 16- and 20-pin packages.
1.2 MCU Block Diagram
The block diagram, Figure 1-1, shows the MC9RS08KA8 MCU structure.
Chapter 1 MC9RS08KA8 Device Overview
MC9RS08KA8 Series Reference Manual, Rev. 4
18 Freescale Semiconductor
Figure 1-1. MC9RS08KA8 Series Block Diagram
Table 1-1 provides the functional versions of the on-chip modules.
Table 1-1. Block Versions
Module Version
RS08 CPU 1
Analog Comparator (RS08 ACMP) 1
Keyboard Interrupt (RS08 KBI) 1
Modulo Timer (RS08 MTIM) 1
Internal Clock Source (RS08 ICSOSC) 1
Analog-to-Digital Converter (RS08 ADC10) 1
Inter-Integrated Circuit (RS08 IIC) 2
16-Bit Timer/PWM (RS08 TPM) 2
XOSC 1
KEYBOARD INTERRUPT
USER FLASH
USER RAM
RS08 CORE
CPU
BDC
16-BIT TIMER/PWM
MODULE (TPM)
PORT B
RS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE REGULATOR
PORT A
LOW-POWER OSCILLATOR
20-MHz INTERNAL CLOCK
SOURCE (ICS)
31.25 kHz to 39.0625 kHz
1 MHz to 5 MHz
(XOSC)
V
SS
V
DD
ANALOG-TO-DIGITAL
CONVERTER (ADC)
10-BIT
PORT C
(MC9RS08KA8 = 8192 BYTES)
(MC9RS08KA4 = 4096 BYTES)
(MC9RS08KA8 = 254 BYTES)
(MC9RS08KA4 = 126 BYTES)
IIC MODULE(IIC)
ANALOG COMPARATOR
(ACMP)
8-BIT TIMER
(MTIM1 and MTIM2)
V
PP
COP
WAKEUP
RTI
LVD
PTC0/ADP8
PTB3/KBIP7/ADP7
PTB2/KBIP6/ADP6
PTB1/KBIP5/ADP5
PTB0/KBIP4/ADP4
PTA2/KBIP2/SDA/ADP2
PTA3/KBIP3/SCL/ADP3
PTA1/KBIP1/TPMCH1/ADP1/ACMP–
PTA0/KBIP0/TPMCH0/ADP0/ACMP+
PTC1/ADP9
PTC2/ADP10
PTB4/TPMCH0
PTC3/ADP11
PTA5/TCLK/RESET
/V
PP
PTA4/ACMPO/BKGD/MS
PTB7/SCL/EXTAL
PTB6/SDA/XTAL
PTB5/TPMCH1
Chapter 1 MC9RS08KA8 Device Overview
MC9RS08KA8 Series Reference Manual, Rev. 4
Freescale Semiconductor 19
1.3 System Clock Distribution
Figure 1-2. System Clock Distribution Diagram
Figure 1-2 shows a simplified clock connection diagram for the MCU. The bus clock frequency is half the
ICS output frequency and used by all internal modules.
MTIM2
FLASH
ICS
ADCCPU
SYSTEM CONTROL LOGIC
RTI
RTICLKS
1 kHz
÷2
ICSOUT
ICSFFCLK
ICSERCLK
FFCLK
1
BUS CLOCK
TCLK
COP
TPMMTIM1IIC
BDCBDC
XOSC
EXTAL
XTAL
÷2
SYNC
1
The fixed frequency clock (FFCLK) is internally synchronized to the bus clock and must not exceed one
half of the bus clock frequency.
Chapter 1 MC9RS08KA8 Device Overview
MC9RS08KA8 Series Reference Manual, Rev. 4
20 Freescale Semiconductor
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