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CHAPTER 10 WATCHDOG TIMER
User’s Manual U15798EJ2V0UD
(1) Watchdog timer mode
A program loop is detected. Upon detection of a program loop, a non-maskable interrupt request or RESET can
be generated.
Table 10-1. Watchdog Timer Program Loop Detection Time
Program Loop Detection Time
2
12
×
1/f
X
(410
µ
s)
2
13
×
1/f
X
(819
µ
s)
2
14
×
1/f
X
(1.64 ms)
2
15
×
1/f
X
(3.28 ms)
2
16
×
1/f
X
(6.55 ms)
2
17
×
1/f
X
(13.1 ms)
2
18
×
1/f
X
(26.2 ms)
2
20
×
1/f
X
(105 ms)
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
Figures in parentheses are for operation with f
X
= 10 MHz
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Table 10-2. Interval Time
Interval Time
2
12
×
1/f
X
(410
µ
s)
2
13
×
1/f
X
(819
µ
s)
2
14
×
1/f
X
(1.64 ms)
2
15
×
1/f
X
(3.28 ms)
2
16
×
1/f
X
(6.55 ms)
2
17
×
1/f
X
(13.1 ms)
2
18
×
1/f
X
(26.2 ms)
2
20
×
1/f
X
(105 ms)
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
Figures in parentheses are for operation with f
X
= 10 MHz
Содержание mPD780344 Series
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