167
CHAPTER 10 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
Preliminary User’s Manual U16035EJ1V0UM
Figure 10-2. Format of Clock Output Select Register (CKS)
Address: FF40H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CKS
BZOE
BCS1
BCS0
CLOE
CCS3
CCS2
CCS1
CCS0
BZOE
BUZ output enable/disable specification
0
Stop clock division circuit operation. BUZ fixed to low level.
1
Enable clock division circuit operation. BUZ output enabled.
BCS1
BCS0
BUZ output clock selection
0
0
f
X
/2
10
(8.18 kHz)
0
1
f
X
/2
11
(4.09 kHz)
1
0
f
X
/2
12
(2.04 kHz)
1
1
f
X
/2
13
(1.02 kHz)
CLOE
PCL output enable/disable specification
0
Stop clock division circuit operation. PCL fixed to low level.
1
Enable clock division circuit operation. PCL output enabled.
CCS3
CCS2
CCS1
CCS0
PCL output clock selection
0
0
0
0
f
X
(8.38 MHz)
0
0
0
1
f
X
/2 (4.19 MHz)
0
0
1
0
f
X
/2
2
(2.09 MHz)
0
0
1
1
f
X
/2
3
(1.04 MHz)
0
1
0
0
f
X
/2
4
(524 kHz)
0
1
0
1
f
X
/2
5
(262 kHz)
0
1
1
0
f
X
/2
6
(131 kHz)
0
1
1
1
f
X
/2
7
(65.5 kHz)
1
0
0
0
f
XT
(32.768 kHz)
Other than above
Setting prohibited
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
f
XT
: Subsystem clock oscillation frequency
3.
Figures in parentheses are for operation with f
X
= 8.38 MHz or f
XT
= 32.768 kHz.