HD404669 Datasheet, PDF (54/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Serial mode register 1A (SM1A: $005)
Bit
Initial value
Read/Write
Bit name
3
0
W
SM1A3
2
0
W
SM1A2
1
0
W
SM1A1
0
0
W
SM1A0
R4₁/SCK₁
SM1A3 mode selection
0
R4₁
1
SCK₁
SM1A2
0
SM1A1
0
SM1A0
0
SCK₁
Output
Clock source
Prescaler
Prescaler
division
ratio
÷2048
1 Output Prescaler
÷512
1
0 Output Prescaler
÷128
1 Output Prescaler
÷32
1
0
0 Output Prescaler
÷8
1 Output Prescaler
÷2
1
0 Output System clock —
1 Input External clock —
Figure 35 Serial Mode Register 1A (SM1A)
Compare enable register (CER: $018)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
—
0
W
—
W
CER3 Not Used CER1
0
0
W
CER0
CER1
0
1
CER0
0
1
×
Analog input pin selection
COMP₀
COMP₁
Not Used
× : Don't care
CER3 Comparator operation selection
0 Normal operation (digital input mode): RD₀/COMP₀ and RD₁/COMP₁ pins function as R
port pins
1 Comparator operation (analog input mode): RD₀/COMP₀ and RD₁/COMP₁ pins function
as comparator pins
Figure 36 Compare Enable Register (CER)
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