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CHAPTER 11 WATCHDOG TIMER
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Table 11-2. Interval Times
Interval Time MCS = 1 CS = 0
211 × 1/fXX 211 × 1/fX (410
µ
s) 212 × 1/fX (819
µ
s)
212 × 1/fXX 212 × 1/fX (819
µ
s) 213 × 1/fX (1.64 ms)
213 × 1/fXX 213 × 1/fX (1.64 ms) 214 × 1/fX (3.28 ms)
214 × 1/fXX 214 × 1/fX (3.28 ms) 215 × 1/fX (6.55 ms)
215 × 1/fXX 215 × 1/fX (6.55 ms) 216 × 1/fX (13.1 ms)
216 × 1/fXX 216 × 1/fX (13.1 ms) 217 × 1/fX (26.2 ms)
217 × 1/fXX 217 × 1/fX (26.2 ms) 218 × 1/fX (52.4 ms)
219 × 1/fXX 219 × 1/fX (104.9 ms) 220 × 1/fX (209.7 ms)
Remarks 1. fXX : 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 fX = 5.0 MHz.