Section number Title Page
24.2 Features.........................................................................................................................................................................519
24.3 Functional overview......................................................................................................................................................521
24.3.1 Unlocking and updating the watchdog.........................................................................................................522
24.3.2 Watchdog configuration time (WCT)..........................................................................................................523
24.3.3 Refreshing the watchdog..............................................................................................................................524
24.3.4 Windowed mode of operation......................................................................................................................524
24.3.5 Watchdog disabled mode of operation.........................................................................................................524
24.3.6 Low-power modes of operation...................................................................................................................525
24.3.7 Debug modes of operation...........................................................................................................................525
24.4 Testing the watchdog....................................................................................................................................................526
24.4.1 Quick test.....................................................................................................................................................526
24.4.2 Byte test........................................................................................................................................................527
24.5 Backup reset generator..................................................................................................................................................528
24.6 Generated resets and interrupts.....................................................................................................................................528
24.7 Memory map and register definition.............................................................................................................................529
24.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH)...........................................................530
24.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)............................................................531
24.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH).................................................................532
24.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)..................................................................532
24.7.5 Watchdog Window Register High (WDOG_WINH)..................................................................................533
24.7.6 Watchdog Window Register Low (WDOG_WINL)...................................................................................533
24.7.7 Watchdog Refresh register (WDOG_REFRESH).......................................................................................534
24.7.8 Watchdog Unlock register (WDOG_UNLOCK).........................................................................................534
24.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH).................................................................534
24.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)..................................................................535
24.7.11 Watchdog Reset Count register (WDOG_RSTCNT)..................................................................................535
24.7.12 Watchdog Prescaler register (WDOG_PRESC)..........................................................................................536
24.8 Watchdog operation with 8-bit access..........................................................................................................................536
24.8.1 General guideline.........................................................................................................................................536
K30 Sub-Family Reference Manual, Rev. 2 Jun 2012
20
Preliminary
Freescale Semiconductor, Inc.
General Business Information