CHAPTER 9 WATCHDOG TIMER
User’s Manual U13850EJ4V0UM
237
(1) Watchdog timer mode
This mode detects inadvertent program loop. When inadvertent program loop is detected, a non-maskable
interrupt can be generated.
Table 9-1. Inadvertent Program Loop Detection Time of Watchdog Timer
Inadvertent Program Loop Detection Time
Clock
f
XX
= 20 MHz
Note
f
XX
= 12.58 MHz
2
14
/f
XX
819.2
µ
s
1.3 ms
2
15
/f
XX
1.6 ms
2.6 ms
2
16
/f
XX
3.3 ms
5.2 ms
2
17
/f
XX
6.6 ms
10.4 ms
2
18
/f
XX
13.1 ms
20.8 ms
2
19
/f
XX
26.2 ms
41.6 ms
2
20
/f
XX
52.4 ms
83.3 ms
2
22
/f
XX
209.7 ms
333.4 ms
Note
Only for the V850/SB1.
(2) Interval timer mode
Interrupts are generated at a preset time interval.
Table 9-2. Interval Time of Interval Timer
Interval Time
Clock
f
XX
= 20 MHz
Note
f
XX
= 12.58 MHz
2
14
/f
XX
819.2
µ
s
1.3 ms
2
15
/f
XX
1.6 ms
2.6 ms
2
16
/f
XX
3.3 ms
5.2 ms
2
17
/f
XX
6.6 ms
10.4 ms
2
18
/f
XX
13.1 ms
20.8 ms
2
19
/f
XX
26.2 ms
41.6 ms
2
20
/f
XX
52.4 ms
83.3 ms
2
22
/f
XX
209.7 ms
333.4 ms
Note
Only for the V850/SB1.
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