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參數(shù)資料
| 型號： | HD404318S |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer |
| 中文描述： | 4位HMCS400系列微機 |
| 文件頁數(shù)： | 49/66頁 |
| 文件大?。?/td> | 305K |
| 代理商： | HD404318S |
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HD404318 Series
49
A/D Converter
The MCU also contains a built-in A/D converter that uses a sequential comparison method with a
resistance ladder. It can perform digital conversion of eight analog inputs with 8-bit resolution. The
following describes the A/D converter.
A/D mode register 1 (AMR1: $019) is used to select digital or analog ports
A/D mode register 2 (AMR2: $01A) is used to set the A/D conversion speed and to select digital or
analog ports
The A/D channel register (ACR: $016) is used to select an analog input channel
A/D conversion is started by setting the A/D start flag (ADSF: $020, 2) to 1. After the conversion is
completed, converted data is stored in the A/D data register, and at the same time, the A/D start flag is
cleared to 0
By setting the I
AD
off flag (IAOF: $021, 2) to 1, the current flowing through the resistance ladder can be
cut off even while operating in standby or active mode
I
AD
off flag
(IAOF)
S
3
A/D channel
register (ACR)
A/D mode
register 2
(AMR2)
A/D mode
register 1
(AMR1)
A/D interrupt
request flag
(IFAD)
Encoder
A/D data
register
(ADRU, L)
A/D start flag
(ADSF)
D/A
AV
CC
AV
SS
Operating mode signal (1 in stop mode)
I
+
Comp
–
A/D
controller
AN
0
AN
1
AN
2
AN
3
AN
4
AN
5
AN
6
AN
7
Control signal
for conversion
time
4
Figure 40 A/D Converter Block Diagram
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| HD404318SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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