HD404669 Datasheet, PDF (50/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Data control register (DCD0 to 2: $02C to $02E)
(DCR0 to 4, DCR6 to A: $030 to $034, $036 to $03A)
DCD0 to DCD2
Bit
3
2
1
0
Initial value
0
0
0
0
Read/Write
W
W
W
W
Bit name
DCD03, DCD02, DCD01– DCD00–
DCD23 DCD22 DCD21 DCD10
DCR0 to DCR4
DCR6 to DCRA
Bit
3
2
1
0
Initial value
0
0
0
0
Read/Write
W
W
W
W
Bit name
DCR03– DCR02– DCR01– DCR00–
DCR43 DCR42 DCR41 DCR40
DCR63– DCR62– DCR61– DCR60–
DCR93 DCR92 DCRA1 DCRA0
Note: Other bits are not used.
All Bits CMOS Buffer Control
0
CMOS buffer Off (high-impedance)
1
CMOS buffer active
Correspondence between ports and DCD/DCR bits
Register Name Bit 3 Bit 2 Bit 1 Bit 0
DCD0
DCD1
DCD2
DCR0
DCR1
DCR2
DCR3
DCR4
DCR6
DCR7
DCR8
DCR9
DCRA
D₃
D₂
D₁
D₀
—
—
D₅
D₄
D₁₁
D₁₀
D₉
—
R0₃
R0₂
R0₁
R0₀
R1₃
R1₂
R1₁
R1₀
R2₃
R2₂
R2₁
R2₀
R3₃
R3₂
R3₁
R3₀
R4₃
R4₂
R4₁
R4₀
R6₃
R6₂
R6₁
R6₀
R7₃
R7₂
R7₁
R7₀
R8₃
R8₂
R8₁
R8₀
R9₃
R9₂
R9₁
R9₀
—
—
RA₁
RA₀
Figure 29 Data Control Registers (DCD, DCR)
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