Table of Contents
Advertisement
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).
TMC26 TMC25 TMC24
0
0
0
0
1
1
Other than above
Remarks f
www.DataSheet4U.com
Table 10-3. Interval Timer Interval Time
Interval Time
× 1/f
4
0
0
2
W
× 1/f
0
1
2
5
W
× 1/f
6
1
0
2
W
× 1/f
7
1
1
2
W
× 1/f
0
0
2
8
W
× 1/f
9
0
1
2
W
Setting prohibited
: Main system clock oscillation frequency
X
f
: Subsystem clock oscillation frequency
XT
f
: Watch timer clock frequency (f
W
TMC24 to TMC26: Bits 4 to 6 of the watch timer mode control register (TMC2)
CHAPTER 10 WATCH TIMER
When operated
When operated at
at f
= 10.0 MHz
f
= 8.38 MHz
X
X
409.6 µ s
489 µ s
819.2 µ s
978 µ s
1.64 ms
1.96 ms
3.28 ms
3.91 ms
6.55 ms
7.82 ms
13.1 ms
15.6 ms
8
/2
or f
)
X
XT
When operated at
When operated at
f
= 4.19 MHz
f
= 32.768 kHz
X
XT
978 µ s
488 µ s
977 µ s
1.96 ms
3.91 ms
1.95 ms
7.82 ms
3.91 ms
15.6 ms
7.81 ms
31.3 ms
15.6 ms
229
Advertisement
Table of Contents
