HD404654 Datasheet, PDF (47/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

Compare enable register (CER: $018)
Bit
Initial value
Read/Write
Bit name
3
0
W
CER3
2
—
—
Not used
1
0
W
CER1
0
0
W
CER0
HD404654 Series
CER3
0
1
Digital/Analog selection
Digital input mode:
RD₀ /COMP₀ and RD₁ /COMP₁
operate as an R port.
Analog input mode:
RD₀ /COMP₀ and RD₁/COMP₁
operate as analog input.
CER1
0
0
1
1
CER0
0
1
0
1
Analog input pin selection
COMP₀
COMP₁
Not used
Not used
Figure 30 Compare Enable Register
Miscellaneous register (MIS: $00C)
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
1
0
—
—
—
—
Not used Not used
MIS3
0
1
Pull-up MOS
on/off selection
Off
On
MIS2
0
1
CMOS buffer
on/off selection
for pin R4₃/SO₁
On
Off
Figure 31 Miscellaneous Register (MIS)
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