HD404654 Datasheet, PDF (87/111 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
1
—
0
—
W
Not used CER1
0
0
W
CER0
HD404654 Series
CER3 Digital/Analog selection
0 Digital input mode:
RD₀ /COMP₀, RD₁ /COMP₁
operate as R port
1 Analog input mode:
RD₀ /COMP₀, RD₁ /COMP₁
operate as analog input
CER1
0
0
1
1
CER0 Analog input pin selection
0 COMP₀
1 COMP₁
0 Not used
1 ^{Not used}
Figure 72 Compare Enable Register
Compare data register (CDR: $017)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
—
— Undefined Undefined
—
—
R
R
Not used Not used CDR1 CDR0
Result of COMP₀ comparison
Result of COMP₁ comparison
Figure 73 Compare Data Register
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