Hitachi H8/3637 Hardware Manual page 360

AMR—A/D mode register
Bit
CKS
Initial value
Read/Write R/W
Clock select
Bit 7
CKS CKS1
0
0
1
1
Note: * Operation is not guaranteed if the conversion time is less than 12.4 µs.
Set bits 5 and 7 for a value of at least 12.4 µs.
ADRR—A/D result register
Bit
ADR7
Initial value Undefined
Read/Write
7 6
TRGE CKS1
0 0
R/W R/W
External trigger select
0 Disables start of A/D conversion by external trigger
1 Enables start of A/D conversion by rising or falling edge
of external trigger at pin ADTRG
Bit 5
Conversion Period
0 Reserved
1 124/ø
0 62/ø
1 31/ø
7 6
ADR6 ADR5
Undefined Undefined
R R
5 4 3
— CH3
0 1 0
— R/W
Channel select
Bit 3 Bit 2 Bit 1
CH3 CH2 CH1
0 0
1
1 0
1
Conversion Time
ø = 2 MHz ø = 5 MHz
— —
62 µs 24.8 µs
31 µs 12.4 µs
15.5 µs
—
5 4 3
ADR4 ADR3
Undefined Undefined
R R R
A/D conversion result
H'C4
2 1
CH2 CH1
0 0
R/W R/W
Bit 0
CH0 Analog input channel
No channel selected
* *
Reserved
* *
0 0 AN
4
1 AN
5
1 0 AN
6
1 AN
7
* * Reserved
*
H'C5
2 1
ADR2 ADR1
Undefined Undefined
R R
A/D converter
0
CH0
0
R/W
Don't care
*
A/D converter
0
ADR0
Undefined
R
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