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參數(shù)資料
| 型號(hào)： | M37480MXT |
| 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(jī) |
| 文件頁數(shù)： | 37/97頁 |
| 文件大?。?/td> | 1076K |
| 代理商： | M37480MXT |
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37
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
A-D Converter
For A-D conversion, the 8-bit successive comparison method is
used. Figure 38 shows a block diagram of A-D conversion. Con-
version is automatically performed once started by the program.
There are 8 analog input pins that are in common with P2
7
to P2
0
of port P2 (4 pins of P2
3
to P2
0
in the 7480 group).
Pin inputs to be A-D converted are selected by bit 2 to bit 0 of the
A-D control register (address 00D9
16
). Bit 3 of the A-D control reg-
ister is an A-D conversion completion bit. This bit is “0” during A-D
conversion and “1” after completion of it. Accordingly, it is possible
by checking this bit to know whether A-D conversion is completed
or not. Figure 39 shows the relationship between the contents of
the A-D control register and input pins to be selected.
The A-D conversion register (address 00DA
16
) stores conversion
results, so it is possible to know them by reading the contents of
this register.
Next, the procedure for executing A-D conversion will be ex-
plained below. First, set values in bit 2 to bit 0 of the A-D control
register and select pins to be A-D converted.
Next, clear the A-D conversion completion bit to “0”. With this write
operation, A-D conversion is started. The A-D conversion is com-
pleted after the lapse of 50 machine cycles (12.5 μs at f(X
IN
)= 8
MHz), and the A-D conversion completion bit is set to “1”. The A-D
conversion interrupt request bit is also set to “1”. Conversion re-
sults are stored in the A-D conversion register.
Fig. 38 Block diagram of A-D converter circuit
Comparator
A-D control circuit
A-D conversion register
(address 00DA
16
)
Switch tree
Ladder resistor
A-D conversion
completion
interrupt request
V
SS
(Note 1)
V
REF
1 : AV
SS
for the 44P6N package of the 7481 group.
2 : The 7480 group is not provided with P2
4
/IN
4
to P2
7
/IN
7
.
P2
0
/IN
0
P2
1
/IN
1
P2
2
/IN
2
P2
3
/IN
3
P2
4
/IN
4
P2
5
/IN
5
P2
6
/IN
6
P2
7
/IN
7
Data bus
A-D control register
(address 00D9
16
)
b4
b0
C
Notes
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| M37481E8T | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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