HD404356 Datasheet, PDF (38/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
Data control register (DCD0 to 2: $02C to $02E)
(DCR0 to 4: $030 to $034, DCR8: $038)
DCD0, DCD2, DCR0 to DCR4, DCR8
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, DCD20,
DCR03– DCR02– DCR01– DCR00–
DCR43, DCR42, DCR41, DCR40,
DCR83 DCR82 DCR81 DCR80
Bits 0 to 3
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
D₇
Not used
D₂
D₆
Not used
DCR0
DCR1
DCR2
DCR3
DCR4
DCR8
R0₃
R0₂
R1₃
R1₂
R2₃
R2₂
R3₃
R3₂
R4₃
R4₂
R8₃
R8₂
Bit 1
D₁
D₅
Not used
R0₁
R1₁
R2₁
R3₁
R4₁
R8₁
Figure 21 Data Control Registers (DCD, DCR)
Bit 0
D₀
D₄
D₈
R0₀
R1₀
R2₀
R3₀
R4₀
R8₀
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