參數(shù)資料
型號: M38073E4-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80
封裝: 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 39/74頁
文件大小: 1182K
代理商: M38073E4-XXXFP
44
MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
D-A control register
(DACON : address 003316)
DA1 output enable bit
DA2 output enable bit
DA3 output enable bit
DA4 output enable bit
Not used (return "0" when read)
0 : Output disabled
1 : Output enabled
b7
b0
AVSS
P65/DAVREF/AN10
"0"
"1"
MSB
"0"
"1"
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
LSB
2R
P56/DA1
P57/DA2
P80/DA3/AN11
P81/DA4/AN12
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 (P65/DAVREF/AN10, P56/DA1, P57/DA2, P80/DA3/AN11,
P81/DA4/AN12) 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=DAVREF x n/256 (n=0 to 255)
Where DAVREF is the reference voltage.
At reset, the D-A conversion registers are cleared to "0016", 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 (003616)
D-A2 conversion register (003716)
D-A3 conversion register (003816)
D-A4 conversion register (003916)
P56/DA1
P57/DA2
P80/DA3/AN11
P81/DA4/AN12
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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