Fujitsu F2MCTM-16LX Hardware Manual page 214

CHAPTER 12 WATCHDOG TIMER
Notes:
• When the timebase timer output (carry signal) is used as a count clock to the watchdog timer, clearing the
timebase timer may extend the time for a watchdog reset to occur.
• When the subclock is used as the machine cock, be sure to set the watchdog timer clock source select bit
(WDCS) in the watch timer control register (WTC) to "0" to select the watch timer output.
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