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Chapter 10
Watch Timer
Preliminary User’s Manual U14913EE1V0UM00
10.3 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 10-2: Watch Timer Mode Control Register (WTM)
Remarks: 1. fw: Watch timer clock frequency
2. Values in parentheses apply when fxx = 4 MHz (Refer to Chapter 8
7
6
5
4
3
2
1
0
Address
R/W
After
Reset
WTM
WTM7
WTM6
WTM5
WTM4
WTM3
WTM2
WTM1
WTM0
FFFFF560H
R/W
00H
WTM6
WTM5
WTM4
Selects Interval Time of Prescaler (f
SUB
= 4 MHz)
0
0
0
2
4
/f
W
(2.408 ms, 512 µs)
0
0
1
2
5
/f
W
(4.096 ms, 1.024 ms)
0
1
0
2
6
/f
W
(8.192 ms, 2.048 ms)
0
1
1
2
7
/f
W
(16.384 ms, 4.096 ms)
1
0
0
2
8
/f
W
(32.768 ms, 8.192 ms)
1
0
1
2
9
/f
W
(65.536 ms, 16.384 ms)
1
1
0
2
10
/f
W
(131.072 ms, 32.768 ms)
1
1
1
2
11
/f
W
(262.144 ms, 62.536 ms)
WTM3
WTM2
Selects Set Time of Watch Flag
0
0
2
14
/f
W
(2.097152 s, 524.188 ms)
0
1
2
13
/f
W
(1.048576 ms, 262.144 ms)
1
0
2
5
/f
W
(4.096 ms, 1.024 ms)
1
1
2
4
/f
W
(2.048 ms, 512 µs)
WTM1
Controls Operation of 5-bit Counter
0
Clears after operation stops
1
Starts
WTM0
Enables Operation of Watch Timer
0
Stops operation (clears both prescaler and timer)
1
Enables operation
WTM7
Selects main input frequency from prescaler
0
Clock input f
CKSEL1
is selected
1
Clock input f
CKSEL2
is selected
Содержание V850E/CA1 ATOMIC
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