參數(shù)資料
型號: M38B79MFH-XXXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù): 74/112頁
文件大?。?/td> 1862K
代理商: M38B79MFH-XXXXFP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
61
D-A CONVERTER
The 38B7 group has one internal D-A converter with 8-bit resolu-
tion.
The D-A conversion is performed by setting the value in the D-A
conversion register. The result of D-A conversion is output from
the DA pin by setting the DA output enable bit to “1”.
When using the D-A converter, the PB0/DA port direction register
bit must be set to “0” (input status).
The output analog voltage V is determined by the value n (deci-
mal 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 register is cleared to “0016”, and the
DA output enable bit is cleared to “0”, and PB0/DA pin becomes
high impedance.
The DA output does not have buffers. Accordingly, connect an ex-
ternal buffer when driving a low-impedance load.
Set VCC to 3.0 V or more when using the D-A converter.
Fig. 62 Block diagram of D-A converter
Fig. 63 Equivalent connection circuit of D-A converter
PB0/DA
D-A conversion register (8)
R-2R resistor ladder
DA 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
2R
LSB
2R
PB0/DA
D-A conversion register
DA output enable bit
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