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104
CHAPTER 7 WATCHDOG TIMER
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Table 7-2. Interval Times
Interval Time MCS = 1 CS = 0
2
11
× 1/fXX 2
11
× 1/fX (410
µ
s) 2
12
× 1/fX (819
µ
s)
2
12
× 1/fXX 2
12
× 1/fX (819
µ
s) 2
13
× 1/fX (1.64 ms)
2
13
× 1/fXX 2
13
× 1/fX (1.64 ms) 2
14
× 1/fX (3.28 ms)
2
14
× 1/fXX 2
14
× 1/fX (3.28 ms) 2
15
× 1/fX (6.55 ms)
2
15
× 1/fXX 2
15
× 1/fX (6.55 ms) 2
16
× 1/fX (13.1 ms)
2
16
× 1/fXX 2
16
× 1/fX (13.1 ms) 2
17
× 1/fX (26.2 ms)
2
17
× 1/fXX 2
17
× 1/fX (26.2 ms) 2
18
× 1/fX (52.4 ms)
2
19
× 1/fXX 2
19
× 1/fX (104.9 ms) 2
20
× 1/fX (209.7 ms)
Remarks 1. f
XX : Main system clock frequency (fX or fX/2)
2. f
X : Main system clock oscillation frequency
3. MCS : Oscillation mode selection register (OSMS) bit 0
4. Values in parentheses when operated at f
X = 5.0 MHz.