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参数资料
| 型号： | M37470M4-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件页数： | 16/49页 |
| 文件大小： | 601K |
| 代理商： | M37470M4-XXXSP |
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20
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
A-D CONVERTER
The A-D conversion uses an 8-bit successive comparison method.
Figure 11 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 P20 to
P27 of port P2 (Only P20 to P23 4-bit for 7470 group. Which ana-
log inputs are to be A-D converted is specified by using bit 2 to bit
0 in the A-D control register (address 00D916). Pins for inputs to
be A-D converted must be set for input by setting the direction reg-
ister 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. Bit 4 in the A-D
control register is a VREF connection selection bit.
During A-D conversion, this bit must be set “1” for the ladder resis-
tor and VREF pin to be connected; after the A-D conversion is
terminated, this bit can be reset to “0” to separate the ladder resis-
tor from the VREF pin. In this way, power consumption in the ladder
resistor can be suppressed while no A-D conversion is performed.
Figure 13 shows the relationship between the contents of A-D
control register and the selected input pins.
The A-D conversion register (address 00DA16) 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 conversion is initiated. The A-D con-
version is completed after an elapse of 50 machine cycles
(12.5
s when f(XIN)= 8 MHz), the A-D conversion end bit is set to
“1”, and the interrupt request bit is set to “1”. The results of conver-
sion are contained in the A-D conversion register.
Fig. 11 A-D converter circuit
Comparator
A-D control circuit
Switch tree
Ladder resistor
A-D conversion completion
interrupt request
VSS (Note 1)
VREF
1 : AVSS for M37471M2/M4/M8/E4/E8-XXXFP
2 : 7470 group does not have P2 4/IN4 to P27/IN7 pins.
P20/IN0
P21/IN1
P22/IN2
P23/IN3
P24/IN4
P25/IN5
P26/IN6
P27/IN7
Data bus
A-D control register
(Address 00D916)
bit 4
Channel
selector
Notes
bit 0
A-D conversion register
(Address 00DA16)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37470M8 | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37470M8-421SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37470M8-XXXSP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37471E4-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37471E4-XXXSP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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