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4. Functions
If the watchdog timer is not cleared periodically, a setting initialization reset (INIT) occurs. In this case the
value of registers in CPU is not guaranteed.
● Function of the hardware watchdog timer
After releasing INITX the hardware watchdog timer starts immediately without stabilization time. If the timer is
not cleared periodically, setting initialization (INIT) reset occurs.
● Period of the hardware watchdog timer
The timer width is 16-bit. Since the RC oscillator is used as clock source of the hardware watchdog timer, the
duration of the timer deviates with the RC oscillator accuracy:
RC oscillation cycle (u s)
Watchdog term (ms)
Note: The watchdog duration elongation (ED1-0) setting is not available on MB91V460. In that case ED1-0 is
always "00".
ED1-0
Min.
5
00
327.68
01
655.36
10
1310.72
11
2621.44
Chapter 21 Hardware Watchdog Timer
Typ.
Max.
10
20
655.36
1310.72
1310.72
2621.44
2621.44
5242.88
5242.88
10485.76
4.Functions
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