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CHAPTER 10 WATCH TIMER
227
Symbol
7
6
5
4
3
2
1
0
Address
When Reset
R/W
TMC2
0
TMC26 TMC25 TMC24 TMC23 TMC22 TMC21 TMC20
FF4AH
00H
R/W
TMC23 TMC20
Watch Flag Set Time Selection
0
0
2
14
/f
W
(0.5 s)
1
2
13
/f
W
(0.25 s)
0
1
2
5
/f
W
(977
µ
s)
1
2
4
/f
W
(488
µ
s)
TMC21
Prescaler Operation Control
Note
0
Clear after operation stops
1
Operation enable
TMC22
5-Bit Counter Operation Control
0
Clear after operation stops
1
Operation enable
TMC26 TMC25 TMC24
Prescaler Interval Time
Selection
0
0
0
2
4
/f
W
(488
µ
s)
0
0
1
2
5
/f
W
(977
µ
s)
0
1
0
2
6
/f
W
(1.95 ms)
0
1
1
2
7
/f
W
(3.91 ms)
1
0
0
2
8
/f
W
(7.81 ms)
1
0
1
2
9
/f
W
(15.6 ms)
Other than above
Setting prohibited
Note
Do not frequently clear the prescaler when using the watch timer.
Remarks
1.
f
W
: Watch timer clock frequency (f
X
/2
8
or f
XT
)
2.
Values in parentheses apply to operation with f
W
= 32.768 kHz.
(2) Watch timer mode control register (TMC2)
This register sets the watch timer operating mode, watch flag set time and prescaler interval time and enables/
disables prescaler and 5-bit counter operations.
TMC2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets TMC2 to 00H.
Figure 10-3. Watch Timer Mode Control Register Format
Содержание 78014Y Series
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