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8.3 A-D conversion method (successive approximation conversion method)
Table 8.3.2 Change in successive approximation register and V
mode
A-D converter halt
1st comparison
2nd comparison
3rd comparison
:
:
8th comparison
Conversion complete
Table 8.3.3 Change in successive approximation register and V
mode
A-D converter halt
1st comparison
2nd comparison
3rd comparison
:
:
10th comparison
Conversion complete
Successive approximation register
b9
1
0 0 0 0 0 0 0 0 0
1
0 0 0 0 0 0 0 0 0
n
1 0 0 0 0 0 0 0 0
9
1st comparison result
n
n
1 0 0 0 0 0 0 0
9
8
2nd comparison result
:
:
n
n
n
n
n
n
n
1
9
8
7
6
5
4
3
n
n
n
n
n
n
n
n
9
8
7
6
5
4
3
2
Successive approximation register
b9
1
0 0 0 0 0 0 0 0 0
1
0 0 0 0 0 0 0 0 0
n
1 0 0 0 0 0 0 0 0
9
1st comparison result
n
n
1 0 0 0 0 0 0 0
9
8
2nd comparison result
:
:
n
n
n
n
n
n
n
n
9
8
7
6
5
4
3
2
n
n
n
n
n
n
n
n
9
8
7
6
5
4
3
2
7751 Group User's Manual
b0
V
REF
[V]
2
V
V
REF
REF
–
[V]
2
2048
V
V
REF
REF
±
–
2
4
V
V
REF
REF
±
±
2
4
V
V
REF
REF
0 0
±
±
2
4
0 0
b0
V
REF
[V]
2
V
V
REF
REF
–
[V]
2
2048
V
V
REF
REF
±
–
2
4
V
V
REF
REF
±
±
2
4
V
V
REF
REF
n
1
±
±
1
2
4
n
n
1
0
A-D CONVERTER
during A-D conversion in 8-bit
ref
Change of V
ref
V
REF
+
•n
=1
9
4
V
REF
[V]
V
REF
–
2048
•n
=0
9
4
•n
=1
V
V
8
REF
REF
[V]
–
8
2048
•n
=0
8
:
:
V
± ...... ± V
V
REF
REF
REF
–
8
256
2048
during A-D conversion in 10-bit
ref
Change of V
ref
V
REF
+
•n
=1
9
4
V
REF
[V]
V
REF
–
2048
•n
=0
9
4
•n
=1
V
V
8
REF
REF
[V]
–
8
2048
•n
=0
8
:
:
V
± ...... ± V
V
REF
REF
REF
–
8
1024
2048
V
REF
+
8
V
REF
–
8
[V]
V
REF
+
8
V
REF
–
8
[V]
8–11
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