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CHAPTER 10 WATCH TIMER
229
10.4.2 Interval timer operation
The watch timer operates as interval timer which generates interrupt requests repeatedly at an interval of the preset
count value.
The interval time can be selected with bits 4 to 6 (TMC24 to TMC26) of the watch timer mode control register
(TMC2).
Table 10-3. Interval Timer Interval Time
TMC26 TMC25 TMC24
Interval Time
When operated
When operated at
When operated at
When operated at
at f
X
= 10.0 MHz
f
X
= 8.38 MHz
f
X
= 4.19 MHz
f
XT
= 32.768 kHz
0
0
0
2
4
×
1/f
W
409.6
µ
s
489
µ
s
978
µ
s
488
µ
s
0
0
1
2
5
×
1/f
W
819.2
µ
s
978
µ
s
1.96 ms
977
µ
s
0
1
0
2
6
×
1/f
W
1.64 ms
1.96 ms
3.91 ms
1.95 ms
0
1
1
2
7
×
1/f
W
3.28 ms
3.91 ms
7.82 ms
3.91 ms
1
0
0
2
8
×
1/f
W
6.55 ms
7.82 ms
15.6 ms
7.81 ms
1
0
1
2
9
×
1/f
W
13.1 ms
15.6 ms
31.3 ms
15.6 ms
Other than above
Setting prohibited
Remarks
f
X
: Main system clock oscillation frequency
f
XT
: Subsystem clock oscillation frequency
f
W
: Watch timer clock frequency (f
X
/2
8
or f
XT
)
TMC24 to TMC26: Bits 4 to 6 of the watch timer mode control register (TMC2)
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