CHAPTER 11 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
User’s Manual U16899EJ2V0UD
244
Figure 11-2. Format of Clock Output Selection 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
Clock division circuit operation stopped. BUZ fixed to low level.
1
Clock division circuit operation enabled. BUZ output enabled.
BCS1
BCS0
BUZ output clock selection
0
0
f
X
/2
10
(9.77 kHz)
0
1
f
X
/2
11
(4.88 kHz)
1
0
f
X
/2
12
(2.44 kHz)
1
1
f
X
/2
13
(1.22 kHz)
CLOE
PCL output enable/disable specification
0
Clock division circuit operation stopped. PCL fixed to low level.
1
Clock division circuit operation enabled. PCL output enabled.
CCS3 CCS2 CCS1 CCS0
PCL
output
clock
selection
Note
0 0 0 0
f
X
(10 MHz)
0 0 0 1
f
X
/2 (5 MHz)
0 0 1 0
f
X
/2
2
(2.5 MHz)
0 0 1 1
f
X
/2
3
(1.25 MHz)
0 1 0 0
f
X
/2
4
(625 kHz)
0 1 0 1
f
X
/2
5
(312.5 kHz)
0 1 1 0
f
X
/2
6
(156.25 kHz)
0 1 1 1
f
X
/2
7
(78.125 kHz)
1 0 0 0
f
XT
(32.768 kHz)
Other than above
Setting prohibited
Note Set the PCL output clock so that the following condition is satisfied.
•
PCL output clock
≤
10 MHz
Remarks 1. f
X
: High-speed system clock oscillation frequency
2. f
XT
: Subsystem clock oscillation frequency
3. Figures in parentheses are for operation with f
X
= 10 MHz or f
XT
= 32.768 kHz.
Содержание MuPD78F0132H
Страница 2: ...User s Manual U16899EJ2V0UD 2 MEMO ...