Fujitsu F2MC-8FX Hardware Manual page 198

CHAPTER 12 HARDWARE WATCHDOG TIMER
RC oscillator prescalar
The RC oscillator prescaler divides the RC oscillator frequency by 2
Hardware watchdog timer counter
This is a 1-bit counter that uses the output of RC oscillator prescalar as the count clock.
Reset control circuit
This circuit generates a reset signal when the hardware watchdog timer counter overflows.
Hardware watchdog timer clear selector
This selector selects the hardware watchdog timer clear signal.
Counter clear control circuit
This circuit controls the clearing and stopping of the hardware watchdog timer counter.
Hardware watchdog timer control register (HWDC)
This register performs setup for activating/clearing the hardware watchdog timer counter.
Input Clock
The hardware watchdog timer uses the output of the RC oscillator prescalar as the input clock (count
clock).
184
16
times.