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Preliminary User’s Manual U15839EE1V0UM00
Chapter 11
Watch Timer
11.1 Function
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.
Figure 11-1 shows the block diagram of the watch timer.
Figure 11-1:
Block Diagram of Watch Timer
(1)
Watch timer
The watch timer generates an interrupt request (INTWT) at time intervals of 500 µs to 16.4 s by
using the clock selector for the Watch Timer (see Chapter 8.2 “Configuration” on page 198).
(2)
Interval timer
The interval timer generates an interrupt request (INTWTI) at time intervals of 500 µs to 2.1 s.
f
W
/2
10
Sel
ec
tor
11-bit prescaler
f
W
/2
8
f
W
/2
7
f
W
/2
6
f
W
/2
5
f
W
/2
4
5-bit counter
INTWT
INTWTI
WTM0
WTM1
WTM3
WTM4
WTM5
WTM6
WTM7
Watch timer mode control
register (WTM)
Internal bus
Clear
Clear
WTM2
f
W
/2
11
Sel
ec
tor
Sel
ec
tor
Sel
ec
tor
CKSEL1
CKSEL2
f
f
f
W
f
W
/2
9
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