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Symbol
TCL2
TCL27 TCL26 TCL25 TCL24
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Caution
Remarks 1. f
CHAPTER 13 BUZZER OUTPUT CONTROL CIRCUIT
Figure 13-2. Timer Clock Select Register 2 Format
7
6
5
4
If data other than identical data is to be rewritten to TCL2, the timer operation must be stopped
first.
: Main system clock oscillation frequency
X
2. f
: Subsystem clock oscillation frequency
XT
3. ×
: don't care
4. Values in parentheses apply to operation with f
3
2
1
0
0
TCL22 TCL21 TCL20
TCL22 TCL21 TCL20
TCL24
TCL27 TCL26 TCL25
= 10.0 MHz or f
X
Address
When Reset
R/W
FF42H
00H
R/W
Watchdog Timer Count
Clock Selection
0
0
0
f
/2
4
(625 kHz)
X
0
0
1
f
/2
5
(313 kHz)
X
6
0
1
0
f
/2
(156 kHz)
X
0
1
1
f
/2
7
(78.1 kHz)
X
1
0
0
f
/2
8
(39.1 kHz)
X
9
1
0
1
f
/2
(19.5 kHz)
X
1
1
0
f
/2
10
(9.8 kHz)
X
12
1
1
1
f
/2
(2.4 kHz)
X
Watch Timer Count Clock Selection
8
0
f
/2
(39.1 kHz)
X
1
f
(32.768 kHz)
XT
Buzzer Output Frequency
Selection
×
×
0
Buzzer output disable
10
1
0
0
f
/2
(9.8 kHz)
X
11
1
0
1
f
/2
(4.9 kHz)
X
1
1
0
f
/2
12
(2.4 kHz)
X
1
1
1
Setting prohibited
= 32.768 kHz.
XT
245
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