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7721 Scheda tecnica(PDF) 262 Page - Renesas Technology Corp

Il numero della parte 7721
Spiegazioni elettronici  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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7721 Scheda tecnica(HTML) 262 Page - Renesas Technology Corp

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7721 Group User’s Manual
12–11
A-D CONVERTER
Table 12.3.2 Change in successive approximation register and Vref during A-D conversion
12.3 A-D conversion method
±
1
1
n7
0 00 000 0
00 0 000 0
10 0
0 0 0 0
n7 n6 10
0 0
0 0
n7 n6 n5 n4 n3 n2 n1 1
n7 n6 n5 n4 n3 n2 n1 n0
b7
b0
1st comparison result
2nd comparison result
Successive approximation register
Change of Vref
A-D converter halt
1st comparison
2nd comparison
3rd comparison
8th comparison
Conversion complete
–
2
VREF
512
VREF
:
2
VREF
±
2
VREF
4
VREF
–
512
VREF
±
2
VREF
4
VREF
8
VREF
–
512
VREF
±
±
2
VREF
4
VREF
8
VREF
± ...... ±
VREF
256
–
512
VREF
[V]
[V]
[V]
[V]
[V]
4
VREF
•n7=1
4
VREF
•n7=0
+
–
8
VREF
8
VREF
•n6=1
•n6=0
+
–
:
:
:
:
:
Fig. 12.3.1 Ideal A-D conversion characteristics
0016
0116
0216
0316
FE16
FF16
Analog input voltage
VREF
256
!1
VREF
256
!2
VREF
256
!3
!253
VREF
256
VREF
256
!254
VREF
256
!255
VREF
VREF
256
!0.5
ldeal A-D conversion characteristics
0
A-D conversion result
FD16



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