FUJITSU F2MCTM-16LX - Manual (Page 287)

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CHAPTER 15 WATCH TIMER
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Interval timer selector
The interval timer selector sets the overflow flag bit when the watch timer counter reaches the interval time
set in the watch timer control register (WTC).
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Watch timer control register (WTC)
The watch timer control register (WTC) selects the interval time, clears the watch timer counter, enables or
disables an interrupt, checks the overflow (carry) state, and clears the overflow flag bit.