參數資料
型號: HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數: 105/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
105
command. Only bit CER3 corresponds to the analog input pin selected with bits CER0 and CER1. After a
compare operation, the data in this register is not retained.
Note on Use:
During the compare operation pins RD
0
/COMP
0
–RD
3
/COMP
3
operate as analog inputs and
cannot operate as R ports.
The comparator can operate in active mode and subactive mode but is disabled in other modes.
The switch for the internal reference voltage is on only when the internal reference voltage is selected by
CER2.
RE
0
/VC
ref
cannot operate as an R port when the external input voltage is selected as the reference.
CER2
0
1
Reference voltage selection
External input voltage
Internal voltage
Bit
Initial value
Read/Write
Bit name
3
0
W
CER3
2
0
W
CER2
0
0
W
CER0
1
0
W
CER1
Compare enable register (CER: $018)
CER3
0
Digital/Analog selection
Digital input mode:
RD /COMP
0
–RD /COMP
3
operate as R port
1
Analog input mode:
RD /COMP
0
–RD /COMP
3
operate as analog input
CER1
0
1
Analog input pin selection
COMP
0
COMP
1
COMP
2
COMP
3
CER0
0
1
0
1
Figure 90 Compare Enable Register (CER)
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