Fujitsu F2MC-8FX Hardware Manual page 208

CHAPTER 13 WATCH PRESCALER
Watch prescaler counter (counter)
This is a 15-bit down-counter that uses the subclock divided by two as its count clock.
Counter clear circuit
This circuit controls the clearing of the watch prescaler.
Interval timer selector
This circuit selects one out of the four bits used for the interval timer among 15 bits available in the watch
prescaler counter.
Watch prescaler control register (WPCR)
This register selects the interval time, clears the counter, controls interrupts and checks the status.
Input Clock
The watch prescaler uses the subclock divided by two as its input clock (count clock).
Output Clock
The watch prescaler supplies its clock to the timer for the oscillation stabilization wait time of the subclock,
the watchdog timer and the watch counter.
194