NEC uPD78P078 - Manual (Page 276)

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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/f XX 2 11 x 1/f X (410
µ
s) 2 12 x 1/f X (819
µ
s)
2 12 x 1/f XX 2 12 x 1/f X (819
µ
s) 2 13 x 1/f X (1.64 ms)
2 13 x 1/f XX 2 13 x 1/f X (1.64 ms) 2 14 x 1/f X (3.28 ms)
2 14 x 1/f XX 2 14 x 1/f X (3.28 ms) 2 15 x 1/f X (6.55 ms)
2 15 x 1/f XX 2 15 x 1/f X (6.55 ms) 2 16 x 1/f X (13.1 ms)
2 16 x 1/f XX 2 16 x 1/f X (13.1 ms) 2 17 x 1/f X (26.2 ms)
2 17 x 1/f XX 2 17 x 1/f X (26.2 ms) 2 18 x 1/f X (52.4 ms)
2 19 x 1/f XX 2 19 x 1/f X (104.9 ms) 2 20 x 1/f X (209.7 ms)
Remarks 1. f XX : Main system clock frequency (f X or f X /2)
2. f X : 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.