171
CHAPTER 10 CLOCK OUTPUT CONTROL CIRCUITS
Preliminary User’s Manual U13420EJ2V0UM00
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
0
0
0
CLOE
CCS3
CCS2
CCS1
CCS0
CLOE
PCL output enable/disable setting
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.
(2) Port mode register (PM7)
This register sets port 7 input/output in 1-bit units.
When using the P70/PCL pin for clock output, set PM70 and the output latch of P70 to 0.
PM7 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM7 to FFH.
Figure 10-3. Format of Port Mode Register 7 (PM7)
Address: FF27H After reset: FFH R/W
Symbol
7
6
5
4
3
2
1
0
PM7
PM77
PM76
PM75
PM74
PM73
PM72
PM71
PM70
PM7n
P7n pin input/output mode selection (n = 0 to 7)
0
Output mode (output buffer ON)
1
Input mode (output buffer OFF)
Содержание mPD780065 Series
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