參數(shù)資料
型號: HD4074849H
廠商: Hitachi,Ltd.
英文描述: CONTACT
中文描述: 4位單片機
文件頁數(shù): 92/125頁
文件大小: 471K
代理商: HD4074849H
HD404849 Series
92
A/D Converter
The MCU has a built-in A/D converter that uses successive approximations with a resistor ladder. It can
measure eight analog inputs with 8-bit resolution. As shown in the block diagram of figure 77, the A/D
converter has a 4-bit A/D mode register, a 4-bit plus 4-bit A/D data register, a 1-bit A/D start flag, and a 1-
bit A/D current off flag.
COMP
+
AN
1
AN
2
AN
3
S
3
Reference
voltage
Reference voltage control
A/D control
logic
A/D start flag
(ADSF)
A/D current
off flag
(IAOF)
Conversion time control
HLT
(1 in stop, watch, and
subactive modes)
A/D mode
register
(AMR)
A/D data
register
(ADRU, ADRL)
Interrupt flag
(IFAD)
Encoder
I
AN
0
R3
0
/AN
4
R3
1
/AN
5
R3
2
/AN
6
R3
3
/AN
7
AV
CC
AV
SS
D/A
Figure 77 Block Diagram of A/D Converter
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