MMC2107 Datasheet, PDF (276/618 Pages) –

Freescale Semiconductor, Inc.
Watchdog Timer Module
DBG — Debug Mode Bit
The read-always, write-once DBG bit controls the function of the
watchdog timer in debug mode. Once written, the DBG bit is not
affected by further writes except in debug mode.
During debug mode, watchdog timer registers can be written and read
normally. When debug mode is exited, timer operation continues from
the state it was in before entering debug mode, but any updates made
in debug mode remain. If a write-once register is written for the first
time in debug mode, the register is still writable when debug mode is
exited.
1 = Watchdog timer stopped in debug mode
0 = Watchdog timer not affected in debug mode
NOTE:
Changing the DBG bit from 1 to 0 during debug mode starts the
watchdog timer. Changing the DBG bit from 0 to 1 during debug mode
stops the watchdog timer.
EN — Watchdog Enable Bit
The read-always, write-once EN bit enables the watchdog timer.
Once written, the EN bit is not affected by further writes except in
debug mode. When the watchdog timer is disabled, the watchdog
counter and prescaler counter are held in a stopped state.
1 = Watchdog timer enabled
0 = Watchdog timer disabled
Technical Data
276
Watchdog Timer Module
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MMC2107 – Rev. 2.0
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