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

11.2

Configuration of Watchdog Timer

The watchdog timer consists of the following blocks:
• Count clock selector
• Watchdog timer counter
• Reset control circuit
• Watchdog timer clear selector
• Counter clear control circuit
• Watchdog timer control register (WDTC)
Block Diagram of Watchdog Timer
20 19
2 x 2/F , 2 x 2/F
CH
(Timebase timer output)
13 12
2 x 2/F , 2 x 2/F
CH
(Watch prescaler output)
Clear signal from
timebase timer
Clear signal from
watch prescaler
Sleep mode starts
Stop mode starts
Timebase timer/
watch mode starts
F : Main clock
CH
F : Subclock
CL
Figure 11.2-1 Block Diagram of Watchdog Timer
Watchdog timer control register (WDTC)
CS1 CS0 -
CH
Count clock
selector
CH
Watchdog timer
clear selector
- WTE3 WTE2 WTE1 WTE0
Watchdog timer
Clearing
activated
Watchdog
timer counter
Counter clear
control circuit
CHAPTER 11 WATCHDOG TIMER
Reset
control
circuit
Overflow
RST
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