參數(shù)資料
型號： M37902FGCGP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機
文件頁數(shù)： 76/143頁
文件大小： 1463K
代理商： M37902FGCGP
M37902FCCHP, M37902FGCHP, M37902FJCHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
76
A-D CONVERTER
The A-D converter is a 10-bit successive approximation converter.
Figure 77 shows the block diagram of the A-D converter, Figure 78
shows the bit configuration of the A-D control register 0 (address
1E
16
), and Figure 79 shows the bit configuration of the A-D control
register 1 (address 1F
16
).
A-D conversion accuracy
Bit 3 of A-D control register 1 is used to select whether to regard the
conversion result as 10-bit or as 8-bit data. The conversion result is
regarded as 10-bit data when bit 3 is “1” and as 8-bit data when bit 3
is “0”.
When the conversion result is used as 10-bit data, the low-order 8
bits of the conversion result is stored in the even address of the cor-
responding A-D register and the high-order 2 bits are stored in bits 0
and 1 at the odd address of the corresponding A-D register. Bits 2 to
7 of the A-D register odd address are “000000
2
” when read.
Fig. 77 Block diagram of A-D converter
When the conversion result is used as 8-bit data, the conversion re-
sult are stored in even address of the corresponding A-D register. In
this case, the value at the A-D register’s odd address is “00
16
” when
read.
A-D conversion frequency
An operation clock (
φ
AD
) of an A-D converter can be selected with bit
7 of the A-D control register 0 and bit 4 of the A-D control register 1.
When bit 4 of the A-D control register 1 is “0”,
φ
AD
becomes f
2
/4
when bit 7 of the A-D control register 0 is “0”,
φ
AD
becomes f
2
/2 when
bit 7 of the A-D control register 0 is “1”.
When bit 4 of the A-D control register 1 is “1”,
φ
AD
becomes f
2
when
bit 7 of the A-D control register 0 is “0”,
φ
AD
becomes f
1
when bit 7 of
the A-D control register 0 is “1”. Note that
φ
AD
= f
1
(in other words,
the fastest speed) can be selected only in the 8-bit mode.
φ
AD
during A-D conversion must be 250 kHz or more because the
comparator uses a capacity coupling amplifier.
Comparator
Resistor ladder network
Selector
AN
0
AN
1
AN
2
AN
3
AN
4
AN
5
AN
6
AN
7
/AD
TRG
V
ref
Successive
A-D register 0
A-D register 1
A-D register 2
A-D register 3
Data bus (odd)
A-D control register 1
A-D control register 0
φ
AD
A-D conversion frequency
(
AD
) select bit 1,0
(1,1)
A-D conversion
frequency selection
f
2
(1,0)
(0,1)
(0,0)
1/2
1/2
f
1
Data bus (even)
AV
SS
V
REF
0
1
V
REF
connection select bit
A-D register 4
A-D register 5
A-D register 6
A-D register 7
Decoder
相關(guān)PDF資料
PDF描述
M37902FCCHP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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M37902FGCHP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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