NEC 78K0 User Manual page 256

8-bit single-chip microcontrollers
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(1) Watch timer
When the X1 input clock or subsystem clock is used, interrupt requests (INTWT) are generated at preset
intervals.
Interrupt Time
4
2
/f
W
5
2
/f
W
13
2
/f
W
14
2
/f
W
Remark
f
: X1 input clock oscillation frequency
X
f
: Subsystem clock oscillation frequency
XT
f
: Watch timer clock frequency
W
(2) Interval timer
Interrupt requests (INTWTI) are generated at preset time intervals.
Interval Time
4
2
/f
W
5
2
/f
W
6
2
/f
W
7
2
/f
W
8
2
/f
W
9
2
/f
W
10
2
/f
W
11
2
/f
W
Remark
f
: X1 input clock oscillation frequency
X
f
: Subsystem clock oscillation frequency
XT
f
: Watch timer clock frequency
W
256
CHAPTER 10 WATCH TIMER
Table 10-1. Watch Timer Interrupt Time
When Operated at f
= 32.768 kHz
XT
µ
488
s
µ
977
s
0.25 s
0.5 s
Table 10-2. Interval Timer Interval Time
When Operated at f
= 32.768 kHz
XT
µ
488
s
µ
977
s
1.95 ms
*
3.91 ms
7.81 ms
15.6 ms
31.3 ms
62.5 ms
User's Manual U15947EJ2V0UD
When Operated at f
= 10 MHz
X
µ
205
s
µ
410
s
0.105 s
0.210 s
When Operated at f
= 10 MHz
X
µ
205
s
µ
410
s
µ
820
s
1.64 ms
3.28 ms
6.55 ms
13.1 ms
26.2 ms

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