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CHAPTER 12 WATCHDOG TIMER
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Table 12-2. Interval Times
Interval Time MCS = 1 MCS = 0
2
11
x 1/fXX 2
11
x 1/fX (410
µ
s) 2
12
x 1/fX (819
µ
s)
2
12
x 1/fXX 2
12
x 1/fX (819
µ
s) 2
13
x 1/fX (1.64 ms)
2
13
x 1/fXX 2
13
x 1/fX (1.64 ms) 2
14
x 1/fX (3.28 ms)
2
14
x 1/fXX 2
14
x 1/fX (3.28 ms) 2
15
x 1/fX (6.55 ms)
2
15
x 1/fXX 2
15
x 1/fX (6.55 ms) 2
16
x 1/fX (13.1 ms)
2
16
x 1/fXX 2
16
x 1/fX (13.1 ms) 2
17
x 1/fX (26.2 ms)
2
17
x 1/fXX 2
17
x 1/fX (26.2 ms) 2
18
x 1/fX (52.4 ms)
2
19
x 1/fXX 2
19
x 1/fX (104.9 ms) 2
20
x 1/fX (209.7 ms)
Remarks 1. f
XX : Main system clock frequency (fX or fX/2)
2. fX : Main system clock oscillation frequency
3. MCS : Bit 0 of oscillation mode selection register (OSMS)
4. Figures in parentheses apply to operation with f
X = 5.0 MHz.