參數(shù)資料
型號(hào)： M3806
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits Microcomputer(8位單片機(jī))
中文描述： 單芯片8位單片機(jī)（8位單片機(jī)）
文件頁(yè)數(shù)： 26/57頁(yè)
文件大?。?/td> 833K
代理商： M3806
MITSUBISHI MICROCOMPUTERS
3806 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
26
D-A Converter
The 3806 group has two internal D-A converters (DA1 and DA2)
with 8-bit resolutions.
The D-A converter is performed by setting the value in the D-A
conversion register. The result of D-A converter is output from the
DA
1
or DA
2
pin by setting the DA output enable bit to “1”.
When using the D-A converter, the corresponding port direction
register bit (DA
1
/P5
6
or DA
2
/P5
7
) should be set to “0” (input sta-
tus).
The output analog voltage V is determined by the value n (base
10) in the 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 the P5
6
/DA
1
and P5
7
/
DA
2
pins are set to input (high impedance).
The D-A output is not buffered, so connect an external buffer when
driving a low-impedance load.
Set V
CC
to 4.0 V or more when using the D-A converter.
Fig. 20 Block diagram of D-A converter
Fig. 21 Equivalent connection circuit of D-A converter
P5
6
/DA
1
D-A1 conversion register (8)
R-2R resistor ladder
DA
1
output enable bit
P5
7
/DA
2
D-A2 conversion register (8)
R-2R resistor ladder
DA
2
output enable bit
D
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
P5
6
/DA1
D-A1
conversion
register
DA
1
output enable bit
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