FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 131)

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CHAPTER 6 WATCHDOG TIMER
Figure 6.4-1 Watchdog timer clear and interval time
Minimum time
Count clock output of
the timebase timer
Watchdog clear Overflow
1-bit watchdog
counter
Watchdog reset
Maximum time
Watchdog clear Overflow
Count clock output of
the timebase timer
1-bit watchdog
counter
Watchdog reset
419.43 ms
838.86 ms