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參數(shù)資料
| 型號： | M38073M4 |
| 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(jī) |
| 文件頁數(shù)： | 44/74頁 |
| 文件大?。?/td> | 1182K |
| 代理商： | M38073M4 |
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44
MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
D-A control register
(DACON : address 0033
16
)
DA
1
output enable bit
DA
2
output enable bit
DA
3
output enable bit
DA
4
output enable bit
Not used (return "0" when read)
0 : Output disabled
1 : Output enabled
b7
b0
AV
SS
P6
5
/DAV
REF
/AN
10
"0"
"1"
MSB
"0"
"1"
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
2R
LSB
2R
P5
/DA
1
P5
7
/DA
2
P8
0
/DA
3
/AN
11
P8
1
/DA
4
/AN
12
D-A
i
conversion
register (Note)
DA
i
output enable bit (Note)
Note: i=1 to 4
Fig. 46. Equivalent connection circuit of D-A converter
D-A Converter
The 3807 group has an on-chip D-A converter with 8-bit resolution
and 4 channels (DAi (i=1—4)). 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 DAi pin by setting the DAi output enable bits
to "1." When using the D-A converter, the corresponding port direc-
tion register bit (P6
5
/DAV
REF
/AN
10
, P5
6
/DA
1
, P5
7
/DA
2
, P8
0
/DA
3
/AN
11
,
P8
1
/DA
4
/AN
12
) should be set to "0" (input status).
The output analog voltage V is determined by the value n (base 10)
in the D-A conversion register as follows:
V=DAV
REF
x n/256 (n=0 to 255)
Where DAV
REF
is the reference voltage.
At reset, the D-A conversion registers are cleared to "00
16
", the DAi
output enable bits are cleared to "0", and DAi pin is set to input (high
impedance). The DA output is not buffered, so connect an external
buffer when driving a low-impedance load.
D-A1 conversion register (0036
16
)
D-A2 conversion register (0037
16
)
D-A3 conversion register (0038
16
)
D-A4 conversion register (0039
16
)
P5
6
/DA
1
P5
7
/DA
2
P8
0
/DA
3
/AN
11
P8
1
/DA
4
/AN
12
Data bus
D-A i conversion register (8)
R-2R resistor ladder
DA
i
output enable bit
Fig. 44. Structure of D-A control register
Fig. 45. Block diagram of D-A converter
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