NEC NEC PD78081(A), User Manual

Page: 127 / 274

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/f
XX
2
11
×
1/f
X
(410
µ
s) 2
12
×
1/f
X
(819
µ
s)
2
12
×
1/f
XX
2
12
×
1/f
X
(819
µ
s) 2
13
×
1/f
X
(1.64 ms)
2
13
×
1/f
XX
2
13
×
1/f
X
(1.64 ms) 2
14
×
1/f
X
(3.28 ms)
2
14
×
1/f
XX
2
14
×
1/f
X
(3.28 ms) 2
15
×
1/f
X
(6.55 ms)
2
15
×
1/f
XX
2
15
×
1/f
X
(6.55 ms) 2
16
×
1/f
X
(13.1 ms)
2
16
×
1/f
XX
2
16
×
1/f
X
(13.1 ms) 2
17
×
1/f
X
(26.2 ms)
2
17
×
1/f
XX
2
17
×
1/f
X
(26.2 ms) 2
18
×
1/f
X
(52.4 ms)
2
19
×
1/f
XX
2
19
×
1/f
X
(104.9 ms) 2
20
×
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 : Oscillation mode selection register (OSMS) bit 0
4. Values in parentheses when operated at f
X
= 5.0 MHz.