Operation Of Watchdog Timer, Time-Base Timer, And Watch Timer - Fujitsu MB90420/5 (A) Series Hardware Manual

WATCHDOG TIMER/TIME-BASE TIMER/WATCH TIMER (SUB-CLOCK)

9.4 Operation of Watchdog Timer, Time-base Timer, and Watch Timer

The operation of the watchdog timer, time-base timer, and watch timer is explained.
n Explanation of operation
• Watchdog timer
The watchdog timer issues a reset request when 0 is not written to the WTE bit of the WDTC register
within the predetermined time due to software nullfunction or hardware upset of program.
• Time-base timer
The time-base timer has the timer function for the oscillation stabilization time wait for the clock source of
watchdog timer, main clock and PLL clock. It also has the interval interrupt function that generates
interrupts at a certain cycle.
• Watch timer
The watch timer has the timer function for the oscillation stabilization time wait for the clock source of
watchdog timer, and sub-clock. It also has the interval interrupt function that generates interrupts at a fixed
cycle.
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