350
Chapter 11
Watch Timer
Preliminary User’s Manual U15839EE1V0UM00
11.2 Configuration
The watch timer consists of the following hardware:
Table 11-1:
Configuration of Watch Timer
11.3 Watch Timer Control Register
The watch timer mode control register (WTM) controls the watch timer.
(1)
Watch timer mode control register (WTM)
This register enables or disables the count clock and operation of the watch timer, sets the interval
time of the prescaler, controls the operation of the 5-bit counter, and sets the set time of the watch
flag.
WTM is set by a 1-bit or 8-bit memory manipulation instruction.
Figure 11-2:
Watch Timer Mode Control Register (WTM) (1/2)
Item
Configuration
Counter
5 bits × 1
Prescaler
11 bits × 1
Control register
Watch timer mode control register (WTM)
7
6
5
4
3
2
1
0
Address
R/W
After
Reset
WTM
WTM7
WTM6
WTM5
WTM4
WTM3
WTM2
WTM1
WTM0
FFFF F560H R/W
00H
WTM7
Selects main input frequency from prescaler
0
Clock input f
CKSEL1
is selected
1
Clock input f
CKSEL2
is selected
WTM6
WTM5
WTM4
Selects Interval Time of Prescaler (f
X
= 4 MHz)
0
0
0
2
4
/f
W
0
0
1
2
5
/f
W
0
1
0
2
6
/f
W
0
1
1
2
7
/f
W
1
0
0
2
8
/f
W
1
0
1
2
9
/f
W
1
1
0
2
10
/f
W
1
1
1
2
11
/f
W
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