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CHAPTER 10 WATCH TIMER
10.1 Watch Timer Functions
The watch timer has the following functions.
• Watch timer
• Interval timer
The watch timer and the interval timer can be used simultaneously.
Figure 10-1 shows watch timer block diagram.
Figure 10-1. Watch Timer Block Diagram
9-bit prescaler
5-bit counter
Selector
Selector
Selector
WTM7
f
X
/2
7
f
X
/2
11
WTM6 WTM5 WTM4
Internal bus
WTM3 WTM1 WTM0
Watch timer mode
control register (WTM)
Clear
Clear
INTWT
INTWTI
f
W
2
4
f
W
2
5
f
W
2
6
f
W
2
7
f
W
2
8
f
W
2
9
f
W
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