Configuration Of Hardware Watchdog Timer - Fujitsu F2MC-8FX Hardware Manual

12.2

Configuration of Hardware Watchdog Timer

The hardware watchdog timer consists of the following blocks:
• Hardware watchdog timer counter
• Reset control circuit
• Hardware watchdog timer clear selector
• Counter clear control circuit
• Hardware watchdog timer control register (HWDC)
Block Diagram of Hardware Watchdog Timer
RC oscillator clock
Sleep mode starts
Stop mode starts
Timebase timer /
watch mode starts
F : Main clock
CH
F : Sub clock
CL
Figure 12.2-1 Block Diagram of Hardware Watchdog Timer
Hardware watchdog timer control register (HWDC)
- -
Reserved
Reserved
RC oscillator
Prescalar
CHAPTER 12 HARDWARE WATCHDOG TIMER
WTE3 WTE2 WTE1 WTE0
Watchdog timer
Clearing
activated
Hardware
watchdog
timer counter
Counter clear
control circuit
Reset
Overflow
control
RST
circuit
183