HD404054 Datasheet, PDF (38/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

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
DCD03– DCD02– DCD01– DCD00–
DCD13 DCD12 DCD11 DCD10
DCD2
Bit
3
2
1
0
Initial value
—
—
0
0
Read/Write
—
—
W
W
Bit name
Not used Not used DCD21 DCD20
DCR0
Bit
Initial value
Read/Write
Bit name
3
2
1
0
—
—
—
0
—
—
—
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
DCR13– DCR12– DCR11– DCR10–
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
—
—
DCR0
—
—
DCR1
DCR2
DCR3
DCR4
R1₃
R1₂
R2₃
R2₂
R3₃
R3₂
R4₃
R4₂
Bit 1
D₁
D₅
D₉
—
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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