參數(shù)資料
型號(hào): M38039MF-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 16.8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 102/136頁
文件大小: 2007K
代理商: M38039MF-XXXHP
68
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
D-A CONVERTER
The 3803/3804 group has two internal D-A converters (DA1 and
DA2) with 8-bit resolution.
The D-A conversion is performed by setting the value in each D-A
conversion register. The result of D-A conversion is output from
the DA1 or DA2 pin by setting the DA output enable bit to “1”.
When using the D-A converter, the corresponding port direction
register bit (P30/DA1 or P31/DA2) must be set to “0” (input status).
The output analog voltage V is determined by the value n (decimal
notation) in the D-A conversion register as follows:
V = VREF n/256 (n = 0 to 255)
Where VREF is the reference voltage.
At reset, the D-A conversion registers are cleared to “0016”, and
the DA output enable bits are cleared to “0”, and the P30/DA1 and
P31/DA2 pins become high impedance.
The DA output does not have buffers. Accordingly, connect an ex-
ternal buffer when driving a low-impedance load.
Fig. 60 Block diagram of D-A converter
Fig. 61 Equivalent connection circuit of D-A converter (DA1)
P30/DA1
D-A1 conversion register (8)
R-2R resistor ladder
DA1 output enable bit
P31/DA2
D-A2 conversion register (8)
R-2R resistor ladder
DA2 output enable bit
D
a
ta
b
u
s
AVSS
VREF
“0”
“1”
MSB
“0”
“1”
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R2R
LSB
2R
P30/DA1
D-A1 conversion register
DA1 output enable bit
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