參數(shù)資料
型號(hào): HD4074654S
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機(jī)
文件頁數(shù): 40/109頁
文件大?。?/td> 430K
代理商: HD4074654S
HD404654 Series
40
DCD0, DCD1
Bit
Initial value
Read/Write
Bit name
3
0
W
DCD03,
DCD13
2
0
W
DCD02,
DCD12
0
0
W
DCD00,
DCD10
1
0
W
DCD01,
DCD11
Data control register
(DCD0 to 2: $02C to $02E)
(DCR0 to 4: $030 to $034)
DCD2
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
DCD20
1
0
W
DCD21
DCR0
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
DCR00
1
Not used
DCR1 to DCR4
Bit
Initial value
Read/Write
Bit name
3
0
W
DCR13–
DCR43
2
0
W
DCR12–
DCR42
0
0
W
DCR10–
DCR40
1
0
W
DCR11–
DCR41
Correspondence between ports and DCD/DCR bits
0
1
DCD0
DCD1
DCD2
DCR0
DCR1
DCR2
DCR3
DCR4
Off (high-impedance)
On
All Bits
CMOS Buffer On/Off Selection
Register Name
D
3
D
7
R1
3
R2
3
R3
3
R4
3
Bit 3
D
2
D
6
R1
2
R2
2
R3
2
R4
2
Bit 2
D
1
D
5
D
9
R1
1
R2
1
R3
1
R4
1
Bit 1
D
0
D
4
D
8
R0
0
R1
0
R2
0
R3
0
R4
0
Bit 0
Figure 23 Data Control Registers (DCD, DCR)
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