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參數(shù)資料
| 型號： | M37478M8 |
| 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)： | 21/47頁 |
| 文件大?。?/td> | 669K |
| 代理商： | M37478M8 |
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21
MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
A-D CONVERTER
The A-D conversion uses an 8-bit successive comparison method.
Figure 13 shows a block diagram of the A-D conversion circuit.
Conversion is automatically carried out once started by the pro-
gram.
There are eight analog input pins which are shared with P2
0
to
P2
7
of port P2 (Only P2
0
to P2
3
4-bit for 7477 group).
Which analog inputs are to be A-D converted is specified by using
bit 2 to bit 0 in the A-D control register (address 00D9
16
). Pins for
inputs to be A-D converted must be set for input by setting the di-
rection register bit to “0”. Bit 3 in the A-D control register is an A-D
conversion end bit. This is “0” during A-D conversion; it is set to “1“
when the conversion is terminated. Therefore, it is possible to
know whether A-D conversion is terminated by checking this bit.
Figure 14 shows the relationship between the contents of A-D
control register and the selected input pins.
Fig. 13 A-D converter circuit
The A-D conversion register (address 00DA
16
) contains informa-
tion on the results of conversion, so that it is possible to know the
results of conversion by reading the contents of this register.
The following explains the procedure to execute A-D conversion.
First, set values to bit 2 to bit 0 in the A-D control register to select
the pins that you want to execute A-D conversion. Next, clear the
A-D conversion end bit to “0”. When the above is done, A-D con-
version is initiated. The A-D conversion is completed after an
elapse of 50 machine cycles (12.5
μ
s when f(X
IN
) = 8MHz), the A-
D conversion end bit is set to “1”, and the interrupt request bit is
set to “1”. The results of conversion are contained in the A-D con-
version register.
Comparator
A-D control circuit
Switch tree
Ladder resistor
A-D conversion
completion
interrupt request
V
SS
(Note 1)
V
REF
1 : AV
SS
for M37478M4/M8/E8-XXXFP.
2 : The 7477 group does not have P2
4
/IN
4
to P2
7
/IN
7
pins.
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
)
bit 3
C
Notes
bit 0
A-D conversion register
(address 00DA
16
)
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|---|---|
| M37477 | Single Chip 8 Bits CMOS Microcomputer(8位單片機) |
| M37478 | Single Chip 8 Bits CMOS Microcomputer(8位單片機) |
| M37477E8SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37477M4-2214FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37477M4-260SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M37478M8TXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8TXXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8TXXXSP/FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37478M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
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