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參數(shù)資料
| 型號： | M38191E2-XXXFP |
| 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)： | 31/60頁 |
| 文件大?。?/td> | 664K |
| 代理商： | M38191E2-XXXFP |
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31
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. JA-2 A-D converter block diagram
D-A CONVERTER
The 3819 group has internal D-A converter with 8-bit resolutions
1 channel.
D-A conversion is performed by setting the value in the D-A con-
version register. The result of D-A conversion is output from the
DA pin by setting the DA output enable bit to “1” . At this time, the
corresponding bit (PB
2
/DA) of the port PB direction register should
be set to “0” (input status).
The output analog voltage V is determined with the value n
(n: decimal number) in the D-A conversion register as follows:
V=V
REF
n/256 (n=0 to 255)
8
V
REF
: the reference voltage
At reset, the D-A conversion register is cleared to “00
16
”, the DA
output enable bits are cleared to “0”, and the PB
2
/DA pin goes to
high impedance state. The D-A output does not build in a buffer, so
connect an external buffer when driving a low-impedance load.
Set V
CC
to 3.0 V or more when using the D-A converter.
Fig. JB-1 D-A converter block diagram
Fig. JB-2 Equivalent connection circuit of D-A converter
C
A-D control circuit
A-D conversion register
(Address 002D
16
)
Resistor ladder
V
REF
AV
SS
Comparator
A-D conversion interrupt request
b7
b0
4
8
P7
0
/AN
0
P7
1
/AN
1
P7
2
/AN
2
P7
3
/AN
3
P7
4
/AN
4
P7
5
/AN
5
P7
6
/AN
6
P7
7
/AN
7
AD-DA control register
(address 002C
16
)
P5
0
/S
IN2
/AN
8
P5
1
/S
out2
/AN
9
P5
2
/S
CLK2
/AN
10
P5
3
/S
RDY2
/AN
11
P5
4
/S
IN3
/AN
12
P5
5
/S
OUT3
/AN
13
P5
6
/S
CLK3
/AN
14
P5
7
/S
RDY3
/AN
15
Data bus
D
PB
2
/DA
D-A conversion register (8)
R-2R resistor ladder
DA output enable bit
AV
SS
V
REF
"0"
"1"
MSB
"0"
"1"
R
2R
LSB
PB
2
/DA
D-A conversion
register
DA output enable bit
2R
2R
2R
2R
2R
2R
2R
R
R
R
R
R
R
2R
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