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CHAPTER 11 WATCHDOG TIMER
231
CHAPTER 11 WATCHDOG TIMER
11.1 Watchdog Timer Functions
The watchdog timer has the following functions.
• Watchdog timer
• Interval timer
Caution
Select the watchdog timer mode or the interval timer mode with the watchdog timer mode register
(WDTM) (the watchdog timer and the interval timer cannot be used simultaneously).
(1) Watchdog timer mode
An inadvertent program loop is detected. Upon detection of the inadvertent program loop, a non-maskable
interrupt request or RESET can be generated.
Table 11-1. Watchdog Timer Inadvertent Program Loop Detection Time
Inadvertent Program Loop
When operated at
Inadvertent Program Loop
When operated at
Detection Time
f
X
= 10.0 MHz
Detection Time
f
X
= 10.0 MHz
2
12
×
1/f
X
409.6
µ
s
2
16
×
1/f
X
6.55
µ
s
2
13
×
1/f
X
819.2
µ
s
2
17
×
1/f
X
13.1
µ
s
2
14
×
1/f
X
1.64 ms
2
18
×
1/f
X
26.2 ms
2
15
×
1/f
X
3.28 ms
2
20
×
1/f
X
104.9 ms
Remark
f
X
: Main system clock oscillation frequency
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Table 11-2. Interval Time
Interval Time
When operated at
Interval Time
When operated at
f
X
= 10.0 MHz
f
X
= 10.0 MHz
2
12
×
1/f
X
409.6
µ
s
2
16
×
1/f
X
6.55 ms
2
13
×
1/f
X
819.2
µ
s
2
17
×
1/f
X
13.1 ms
2
14
×
1/f
X
1.64 ms
2
18
×
1/f
X
26.2 ms
2
15
×
1/f
X
3.28 ms
2
20
×
1/f
X
104.9 ms
Remark
f
X
: Main system clock oscillation frequency
Summary of Contents for 78014Y Series
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