參數(shù)資料
型號: M38B79MFH
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
文件頁數(shù): 61/109頁
文件大?。?/td> 1559K
代理商: M38B79MFH
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
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 PB
0
/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 = V
REF
n/256 (n = 0 to 255)
Where V
REF
is the reference voltage.
At reset, the D-A conversion register is cleared to
00
16
, and the
DA output enable bit is cleared to
0
, and PB
0
/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 V
CC
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
P
B
0
/
D
A
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8
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2
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2
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2
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P
B
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