參數(shù)資料
型號: HD40C4389
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機(jī))
中文描述: 低電壓如同在微機(jī)芯片的A / D轉(zhuǎn)換器(帶片上的A / D轉(zhuǎn)換器的低壓微計算機(jī))
文件頁數(shù): 106/162頁
文件大?。?/td> 482K
代理商: HD40C4389
HD404374/HD404384/HD404389/HD404082/HD404084 Series
106
A/D Converter (HD404374/HD404384/HD404389 Series)
The MCU has a built-in successive approximation type A/D converter using a resistance ladder method,
capable of digital conversion of four analog inputs with an 10-bit resolution. The A/D converter block
diagram is shown in figure 63.
The A/D converter comprises the following four registers.
A/D mode register (AMR: $028)
A/D start flag (ADSF: $020,2)
A/D data register (ADRL: $029, ADRM: $02A, ADRU: $02B)
Module standby register 2 (MSR2: $00E)
Note : With the HD404374, HD404384, and HD404389 Series emulator, write 1 to bit 0 (ADRL0) of A/D
data register-lower (ADRL). This bit need not be written in the mask ROM and ZTAT
TM
versions
in these series, although writing 1 will have no effect.
Interrupt flag
(IFAD)
Encoder
A/D data
register
(ADRU, ADRM, ADRL)
S
Conversion time control
A/D
start flag
(ADSF)
COMP
R
v
Reference
voltage control
R7
0
/AN
0
R7
1
/AN
1
R7
2
/AN
2
R7
3
/AN
3
*AN
4
*AN
5
+
A/D
control
logic
A/D mode
register
(AMR)
AV
CC
Note: * Applies to HD404389 Series.
AV
SS
D/A
3
Operating mode signal (set to 1 in
stop, watch, and subactive modes,
and during module standby)
Figure 63 A/D Converter Block Diagram
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