NEC V850/SB1 User Manual page 261

(1) Watchdog timer mode
This mode detects an inadvertent program loop. When an inadvertent program loop is detected, a non-maskable
interrupt can be generated.
Table 9-1. Inadvertent Program Loop Detection Time of Watchdog Timer
(2) Interval timer mode
Interrupts are generated at a preset time interval.
CHAPTER 9
Clock Inadvertent Program Loop Detection Time
f = 20 MHz
XX
14 819.2 µ s
2 /f
XX
15
2 /f
1.6 ms
XX
16
2 /f
3.3 ms
XX
17
2 /f 6.6 ms
XX
18
13.1 ms
2 /f
XX
19
2 /f 26.2 ms
XX
20
2 /f 52.4 ms
XX
22
2 /f
209.7 ms
XX
Note Only in the V850/SB1.
Table 9-2. Interval Time of Interval Timer
Clock
f = 20 MHz
XX
14 819.2 µ s
2 /f
XX
15
2 /f
1.6 ms
XX
16
2 /f
3.3 ms
XX
17
6.6 ms
2 /f
XX
18
2 /f 13.1 ms
XX
19
26.2 ms
2 /f
XX
20
2 /f 52.4 ms
XX
22
2 /f
209.7 ms
XX
Note Only in the V850/SB1.
User's Manual U13850EJ6V0UD
WATCHDOG TIMER
Note
f = 12.58 MHz
XX
1.3 ms
2.6 ms
5.2 ms
10.4 ms
20.8 ms
41.6 ms
83.3 ms
333.4 ms
Interval Time
Note
f = 12.58 MHz
XX
1.3 ms
2.6 ms
5.2 ms
10.4 ms
20.8 ms
41.6 ms
83.3 ms
333.4 ms
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