參數(shù)資料
型號: HD404459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 48/120頁
文件大?。?/td> 692K
代理商: HD404459
HD404459 Series
48
R Ports (R0–RA):
39 input/output pins and 5 input pins addressed in 4-bit units. Data is input to these
ports by the LAR and LBR instructions, and output from them by the LRA and LRB instructions. Output
data is stored in the port data register (PDR) for each pin. The on/off statuses of the output buffers of the R
ports are controlled by R-port data control registers (DCR0–DCR9: $030–$039) that are mapped to
memory addresses (figure 30).
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
DCD0, DCD1
Data control register
(DCD0 to DCD2: $02C to $02E)
(DCR0 to DCR9: $030 to $039)
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
DCD20
1
0
W
DCD21
DCD2
Bit
Initial value
Read/Write
Bit name
3
0
W
DCR03–
DCR83
2
0
W
DCR02–
DCR82
0
0
W
DCR00–
DCR80
1
0
W
DCR01–
DCR81
DCR0 to DCR8
Bit
Initial value
Read/Write
Bit name
3
Not used
2
0
W
DCR92
0
0
W
DCR90
1
0
W
DCR91
DCR9
Correspondence between ports and DCD/DCR bits
0
1
DCD0
DCD1
DCD2
DCR0
DCR1
DCR2
DCR3
DCR4
DCR5
DCR6
DCR7
DCR8
DCR9
Off (high-impedance)
On
All Bits
CMOS Buffer On/Off Selection
Register Name
D
3
D
7
R0
3
R1
3
R2
3
R3
3
R4
3
R5
3
R6
3
R7
3
R8
3
Bit 3
D
2
D
6
R0
2
R1
2
R2
2
R3
2
R4
2
R5
2
R6
2
R7
2
R8
2
R9
2
Bit 2
D
1
D
5
D
9
R0
1
R1
1
R2
1
R3
1
R4
1
R5
1
R6
1
R7
1
R8
1
R9
1
Bit 1
D
0
D
4
D
8
R0
0
R1
0
R2
0
R3
0
R4
0
R5
0
R6
0
R7
0
R8
0
R9
0
Bit 0
Figure 30 Data Control Registers (DCD, DCR)
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