參數(shù)資料
型號(hào)： 7560
英文描述： 7560 Group Datasheet Datasheet 1682K/JAN.14.03
中文描述： 7560組數(shù)據(jù)表數(shù)據(jù)表1682K/JAN.14.03
文件頁(yè)數(shù)： 43/90頁(yè)
文件大?。?/td> 1682K
代理商： 7560
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
42
D-A Converter
The 7560 group has a D-A converter with 8-bit resolution and 2
channels (DA
1
, DA
2
).
The D-A converter is started by setting the value in the D-A con-
version register. When the DA
1
output enable bit or the DA
2
output
enable bit is set to
“
1
”
, the result of D-A conversion is output from
the corresponding DA pin. When using the D-A converter, set the
P5
6
/DA
1
pin and the P5
7
/DA
2
pin to input mode (set
“
0
”
to bits 6,
7 of port P5 direction register) and the pull-up resistor should be in
the OFF state (set
“
0
”
to bit 3 of PULL register B) previously.
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 set to
“
00
16
”
, the DA
1
output enable bit and the DA
2
output enable bit are set to
“
0
”
, and
the P5
6
/DA
1
pin and the P5
7
/DA
2
pin goes to high impedance
state. The DA converter is not buffered, so connect an external
buffer when driving a low-impedance load.
I
Note on applied voltage to V
REF
pin
When these pins are used as D-A conversion output pins, the Vcc
level is recommended for the applied voltage to V
REF
pin.
When the voltage below Vcc level is applied, the D-A conversion
accuracy may be worse.
Fig. 43 Structure of D-A control register
Fig. 44 Block diagram of D-A converter
D
0
1
A
1
:
:
o
i
s
n
u
a
a
t
p
b
b
u
l
e
e
t
d
d
e
n
a
b
l
e
b
i
t
D
E
l
D
0
1
A
2
:
:
o
i
s
n
u
a
a
t
p
b
b
u
l
e
e
t
d
d
e
n
a
b
l
e
b
i
t
D
E
l
N
(
W
o
t
r
i
u
t
e
s
e
“
d
0
(
“
o
0
”
t
a
h
t
e
r
e
e
a
b
d
i
i
s
n
g
a
)
t
”
t
s
t
w
r
i
t
i
n
g
.
)
b
0 0 0 0 0 0
7
b
0
D
(
D
-
A
A
C
c
o
O
n
N
t
r
o
:
l
a
r
d
e
g
d
i
e
s
t
s
e
s
r
r
0
0
3
6
1
6
)
D
a
t
a
b
u
s
P5
6
/DA
1
D-A1 conversion register (8)
R
-
2
R
r
e
s
i
s
t
o
r
l
a
d
d
e
r
DA
1
output enable bit
(DA1: address 0032
16
)
P5
7
/DA
2
D-A2 conversion register (8)
R
-
2
R
r
e
s
i
s
t
o
r
l
a
d
d
e
r
DA
2
output enable bit
(DA2: address 0033
16
)
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