CHAPTER 10 WATCH TIMER
Preliminary User’s Manual U17260EJ3V1UD
288
(1) Watch
timer
When the peripheral hardware clock or subsystem clock is used, interrupt request signals (INTWT) are
generated at preset intervals.
Table 10-1. Watch Timer Interrupt Time
Interrupt Time
When Operated at
f
SUB
= 32.768 kHz
When Operated at
f
PRS
= 2 MHz
When Operated at
f
PRS
= 5 MHz
When Operated at
f
PRS
= 10 MHz
When Operated at
f
PRS
= 20 MHz
2
4
/f
W
488
µ
s 1.02
ms
410
µ
s 205
µ
s 102
µ
s
2
5
/f
W
977
µ
s 2.05
ms
819
µ
s 410
µ
s 205
µ
s
2
13
/f
W
0.25 s
0.52 s
0.210 s
0.105 s
52.5 ms
2
14
/f
W
0.5 s
1.05 s
0.419 s
0.210 s
0.105 s
Remark
f
PRS
: Peripheral hardware clock frequency
f
SUB
: Subsystem clock frequency
f
W
: Watch timer clock frequency (f
PRS
/2
7
or f
SUB
)
(2) Interval
timer
Interrupt request signals (INTWTI) are generated at preset time intervals.
Table 10-2. Interval Timer Interval Time
Interval Time
When Operated at
f
SUB
= 32.768 kHz
When Operated at
f
PRS
= 2 MHz
When Operated at
f
PRS
= 5 MHz
When Operated at
f
PRS
= 10 MHz
When Operated at
f
PRS
= 20 MHz
2
4
/f
W
488
µ
s 1.02
ms
410
µ
s 205
µ
s 102
µ
s
2
5
/f
W
977
µ
s 2.05
ms
820
µ
s 410
µ
s 205
µ
s
2
6
/f
W
1.95 ms
4.10 ms
1.64 ms
820
µ
s 410
µ
s
2
7
/f
W
3.91 ms
8.20 ms
3.28 ms
1.64 ms
820
µ
s
2
8
/f
W
7.81 ms
16.4 ms
6.55 ms
3.28 ms
1.64 ms
2
9
/f
W
15.6 ms
32.8 ms
13.1 ms
6.55 ms
3.28 ms
2
10
/f
W
31.3 ms
65.5 ms
26.2 ms
13.1 ms
6.55 ms
2
11
/f
W
62.5 ms
131.1 ms
52.4 ms
26.2 ms
13.1 ms
Remark
f
PRS
: Peripheral hardware clock frequency
f
SUB
: Subsystem clock frequency
f
W
: Watch timer clock frequency (f
PRS
/2
7
or f
SUB
)
10.2 Configuration of Watch Timer
The watch timer includes the following hardware.
Table 10-3. Watch Timer Configuration
Item Configuration
Counter 5
bits
×
1
Prescaler 11
bits
×
1
Control register
Watch timer operation mode register (WTM)
Содержание 78K/0 Series
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