參數(shù)資料
型號: 7513
英文描述: 7513 Group Datasheet Datasheet 1067K/FEB.06.01
中文描述: 7513組數(shù)據(jù)表數(shù)據(jù)表1067K/FEB.06.01
文件頁數(shù): 38/66頁
文件大?。?/td> 1067K
代理商: 7513
37
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7513 Group
D-A CONVERTER
The 7513 group has an on-chip D-A converter with 8-bit resolution
and 2 channels (DAi (i=1, 2)). 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. 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).
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.
Fig. 37 Structure of D-A control register
Fig. 38 Block diagram of D-A converter
Fig. 39 A-D converter, D-A converter block diagram
DA
1
output enable bit/DA
1
V
REF
ON/OFF switch
DA
2
output enable bit/DA
2
V
REF
ON/OFF switch
Not used (return
0
when read)
0 : Output disabled/OFF
1 : Output enabled/ON
b7
b0
D-A control register
(DACON : address 0036
16
)
V
REF
Resistor ladder
A-D conversion register
(10 bits)
D-A1 conversion register (8 bits)
D-A2 conversion register (8 bits)
R-2R resistor ladder
R-2R resistor ladder
D-A2 output
D-A1 output
(P5
6
)
(P5
7
)
D-A2 output enable switch
D-A2 V
REF
ON/OFF switch
D-A1 output enable switch
D-A1 V
REF
ON/OFF switch
V
REF
input
ON/OFF switch
Internal: D-A output
External: V
REF
Reference voltage input select switch
D-A1 conversion register
(DA1: address 0034
16
)
D-A2 conversion register
(DA2: address 0035
16
)
P5
6
/DA
1
P5
7
/DA
2
Data bus
D-A i conversion register (8)
R-2R resistor ladder
DA i output enable bit
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