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Chapter 13 Watch Timer Functions
13.1 Functions
Note 1
f
BRG
f
W
f
/2
f
W
XT
Figure 13-1
Note
The Watch Timer has the following functions.
• Watch Timer
• Interval timer
The Watch Timer and interval timer functions can be used at the same time.
Clear
11-bit prescaler
4
5
6
7
8
10
f
/2
f
/2
f
/2
f
/2
f
/2
W
W
W
W
W
WTM7
WTM6
WTM5
Block diagram of Watch Timer
1.
The Prescaler3 output f
For details refer to "Clock Generator" on page 179.
2.
f
: Sub oscillator frequency
XT
f
: Watch Timer clock frequency
W
INTWT: Watch Timer interrupt
INTWTI: Interval timer interrupt
User's Manual U18743EE1V2UM00
5-bit counter
11
9
f
/2
f
/2
W
W
3
WTM4
WTM3
WTM2
Watch timer operation mode register
(WTM)
Internal bus
is also used for CSIB0.
BRG
Reset
INTWT
Clear
INTWTI
WTM1
WTM0
379
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