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7477 Datasheet(PDF) 158 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  354 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 158 Page - Renesas Technology Corp

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1-141
7470/7471/7477/7478 GROUP USER’S MANUAL
HARDWARE
1.14 A-D converter
Likewise, bit 5 to bit 0 are determined according to comparison results of the 3rd to 8th
comparisons.
A digital value (contents of the A-D conversion register) corresponding to the analog input
voltage VIN is determined bit by bit by these operations.
Figure 1.14.2 shows the changes of the contents of the A-D conversion register and the reference
voltage during A-D conversion.
5 After completion of A-D conversion, bit 3 of the A-D control register is set to “1” and an interrupt
request is generated concurrently with the completion of A-D conversion.
Notes 1: An A-D conversion result can be obtained by reading the A-D conversion register after
bit 3 of the A-D control register is set to “1.”
2: The A-D conversion result is held in the A-D conversion register until bit 3 of the A-D
control register is set to “1” again after completion of the next A-D conversion.
Fig 1.14.2 Contents of A-D conversion register and reference voltage during A-D conversion
1 0000 0 0 0
12
10 0 0 00
1 000 0 0 0
1
1 23 4 567
1
VREF
2
VREF
512
–
VREF
2
VREF
4
VREF
512
–
±
VREF
2
VREF
4
VREF
8
VREF
512
–
±
±
0 0000 0 0 0
0
m
12 3 45 6 7 8
VREF
2
VREF
4
VREF
8
±
±
±
VREF
512
–
VREF
256
±
.......
m
.....
A-D conversion start
Contents of A-D conversion register
1st comparison start
2nd comparison start
3rd comparison start
8th comparison start
Reference voltage (V ref) [V]
Digital value corresponding
to analog input voltage
: Value determined by
m th (m=1 to 8) result
A-D conversion completion
(8th comparison completion)



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