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HD404054 Datasheet, PDF (40/103 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory | |||
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HD404054 Series/HD404094 Series
Data control register (DCD0 to 2: $02C to $02E)
(DCR0 to 4: $030 to $034)
DCD0, DCD1
Bit
3
2
1
0
Initial value
0
0
0
0
Read/Write
W
W
W
W
Bit name
DCD03â DCD02â DCD01â DCD00â
DCD13 DCD12 DCD11 DCD10
DCD2
Bit
3
2
1
0
Initial value
â
â
0
0
Read/Write
â
â
W
W
Bit name
Not used Not used DCD21 DCD20
DCR0
Bit
Initial value
Read/Write
Bit name
3
2
1
0
â
â
â
0
â
â
â
W
Not used Not used Not used DCR00
DCR1 to DCR4
Bit
3
2
1
0
Initial value
0
0
0
0
Read/Write
W
W
W
W
Bit name
DCR13â DCR12â DCR11â DCR10â
DCR43 DCR42 DCR41 DCR40
All Bits
0
1
CMOS Buffer On/Off Selection
Off (high-impedance)
On
Correspondence between ports and DCD/DCR bits
Register Name
Bit 3
Bit 2
DCD0
DCD1
DCD2
D3
D2
D7
D6
â
â
DCR0
â
â
DCR1
DCR2
DCR3
DCR4
R13
R12
R23
R22
R33
R32
R43
R42
Bit 1
D1
D5
D9
â
R11
R21
R31
R41
Bit 0
D0
D4
D8
R00
R10
R20
R30
R40
Figure 20 Data Control Registers (DCD, DCR)
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