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Section 12 A/D Converter
Bits 3 to 0: Channel select (CH3 to CH0)
Bits 3 to 0 select the analog input channel.
The channel selection should be made while bit ADSF is cleared to 0.
Bit 3
Bit 2
CH3
CH2
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
12.2.3
A/D Start Register (ADSR)
Bit
7
ADSF
Initial value
0
Read/Write
R/W
The A/D start register (ADSR) is an 8-bit read/write register for starting and stopping A/D
conversion.
A/D conversion is started by writing 1 to the A/D start flag (ADSF) or by input of the designated
edge of the external trigger signal, which also sets ADSF to 1. When conversion is complete, the
converted data is set in ADRRH and ADRRL, and at the same time ADSF is cleared to 0.
Rev. 6.00 Aug 04, 2006 page 422 of 680
REJ09B0145-0600
Bit 1
Bit 0
CH1
CH0
Analog Input Channel
*
*
No channel selected
0
0
AN
0
1
AN
1
0
AN
1
1
AN
0
0
AN
0
1
AN
1
0
AN
1
1
AN
0
0
AN
0
1
AN
1
0
AN
1
1
AN
6
5
1
1
0
1
2
3
4
5
6
7
8
9
10
11
4
3
1
1
(initial value)
*: Don't care
2
1
0
1
1
1
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