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| HD6433044 Datasheet, PDF (823/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer | |||
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ADCSRâA/D Control/Status Register
H'E8
A/D
Bit
Initial value
Read/Write
7
ADF
0
R/(W)*
6
ADIE
0
R/W
5
ADST
0
R/W
4
SCAN
0
R/W
3
CKS
0
R/W
2
CH2
0
R/W
1
CH1
0
R/W
0
CH0
0
R/W
Clock select
0 Conversion time = 266 states (maximum)
1 Conversion time = 134 states (maximum)
Channel select 2 to 0
Group Channel
Selection Selection
Description
CH2 CH1 CH0 Single Mode Scan Mode
Scan mode
0 Single mode
1 Scan mode
A/D start
0
0
0 AN 0
1 AN 1
1
0 AN 2
1 AN 3
1
0
0 AN 4
1 AN 5
1
0 AN 6
1 AN 7
AN 0
AN 0, AN 1
AN 0 to AN 2
AN 0 to AN 3
AN 4
AN 4, AN 5
AN 4 to AN 6
AN 4 to AN 7
0 A/D conversion is stopped
1 Single mode: A/D conversion starts; ADST is automatically cleared to 0 when
conversion ends
Scan mode: A/D conversion starts and continues, cycling among the selected
channels, until ADST is cleared to 0 by software, by a reset, or by a
transition to standby mode
A/D interrupt enable
0 A/D end interrupt request is disabled
1 A/D end interrupt request is enabled
A/D end flag
0 [Clearing condition]
Read ADF while ADF = 1, then write 0 in ADF
1 [Setting conditions]
Single mode: A/D conversion ends
Scan mode: A/D conversion ends in all selected channels
Note: * Only 0 can be written, to clear flag.
816
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