144
CHAPTER 10 WATCHDOG TIMER
Preliminary User’s Manual U14581EJ3V0UM00
(1) Watchdog timer mode
A runaway is detected. Upon detection of the runaway, a non-maskable interrupt request or RESET can be
generated.
Table 10-1. Watchdog Timer Runaway Detection Time
Runaway Detection Time
2
12
×
1/f
X
(489
µ
s)
2
13
×
1/f
X
(978
µ
s)
2
14
×
1/f
X
(1.96 ms)
2
15
×
1/f
X
(3.91 ms)
2
16
×
1/f
X
(7.82 ms)
2
17
×
1/f
X
(15.6 ms)
2
18
×
1/f
X
(31.3 ms)
2
20
×
1/f
X
(125 ms)
Remarks 1. f
X
: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with f
X
= 8.38 MHz.
(2) Interval timer mode
Interrupt requests are generated at preset time intervals.
Table 10-2. Interval Time
Interval Time
2
12
×
1/f
X
(489
µ
s)
2
13
×
1/f
X
(978
µ
s)
2
14
×
1/f
X
(1.96 ms)
2
15
×
1/f
X
(3.91 ms)
2
16
×
1/f
X
(7.82 ms)
2
17
×
1/f
X
(15.6 ms)
2
18
×
1/f
X
(31.3 ms)
2
20
×
1/f
X
(125 ms)
Remarks 1. f
X
: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with f
X
= 8.38 MHz.
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