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參數(shù)資料
| 型號： | M38747MCF |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 58/92頁 |
| 文件大小： | 1292K |
| 代理商： | M38747MCF |
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58
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
D-A CONVERTER
The 3874 group has an on-chip D-A converter with 8-bit resolution
and 1 channel. The D-A conversion is performed by setting the
value in the A-D/D-A conversion register. The result of D-A con-
verter is output from DA pin by setting the DA output enable bits to
“1”. When using the D-A converter, the corresponding port direc-
tion register bit (P8
0
/DA) should be set to “0” (input status).
The output analog voltage V is determined by the value n (base
10) in the A-D/D-A conversion register as follows:
V=V
REF
n/256 (n=0 to 255)
Where V
REF
is the reference voltage.
At reset, the D-A conversion registers are cleared to “00
16
”, the
DA output enable bits are cleared to “0”, and P8
0
/DA pin becomes
high impedance. The DA output is not buffered, so connect an ex-
ternal buffer when driving a low-impedance load. When using D-A
converter, set 4.0 V or more to V
CC
.
I
Note
When reading the A-D/D-A conversion register, the A-D conver-
sion result is read, and the set value for D-A conversion is not
read.
Fig. 61 Block diagram of D-A converter
Fig. 62 Equivalent connection circuit of D-A converter
P8
0
/DA
Data bus
D-A conversion register (8)
R-2R resistor ladder
DA
output enable bit
AV
SS
V
REF
“0”
“1”
MSB
“0”
“1”
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
2R
LSB
2R
P8
0
/DA
D-A
conversion
register
DA
output enable bit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M38747MCF-XXXFS | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38747MCF-XXXGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38747MCT | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38747MCT-XXXFS | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38747MCT-XXXGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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