參數(shù)資料
型號(hào)： M37560MF
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(yè)數(shù)： 37/65頁(yè)
文件大小： 955K
代理商： M37560MF
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
37
D-A Converter
The 7560 group has an on-chip D-A converter with 8-bit resolution
and 2 channels (DAi (i=1, 2)). After the DA
1
selection bit or DA
2
selection bit is set to
“
0
”
, the D-A converter is performed by setting
the value in the D-A conversion register. The result of D-A con-
verter is output from DAi pin. When using the D-A converter, the
corresponding port direction register bit (P5
6
/DA
1
, P5
7
/DA
2
)
should be set to
“
0
”
(input status) and the pull-up resistor should
be in the OFF state.
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
DAi output enable bits are cleared to
“
0
”
, and DAi pin goes to
high impedance state. The DA output is not buffered, so connect
an external buffer when driving a low-impedance load.
I
Note on applied voltage to V
REF
pin
When the P5
6
/DA
1
pin and P5
7
/DA
2
pin are used as I/O ports, be
sure to apply Vcc level 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. 37 Structure of D-A control register
Fig. 38 Block diagram of D-A converter
DA
1
output enable bit
0 : Disabled
1 : Enabled
DA
2
output enable bit
0 : Disabled
1 : Enabled
Not used (return
“
0
”
when read)
(Do not write
“
1
”
to these bits.)
b7
b0
D-A control register
(DACON : address 0036
16
)
D
(
D
D
(
D
-
A
A
-
A
A
1
1
2
2
:
:
c
c
o
a
o
a
n
d
n
d
v
d
v
d
e
r
e
e
r
e
r
s
s
r
s
s
i
o
o
n
0
n
0
r
3
r
0
3
e
g
2
1
e
g
3
1
i
s
6
)
i
s
6
)
t
e
r
s
i
s
0
t
e
r
P5
6
/DA
1
P5
7
/DA
2
Data bus
D-A i conversion register (8)
R-2R resistor ladder
D
A
i
o
u
t
p
u
t
e
n
a
b
l
e
b
i
t
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