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参数资料
| 型号： | M37481M8-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | 10 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件页数： | 36/100页 |
| 文件大小： | 1457K |
| 代理商： | M37481M8-XXXFP |
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37
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PRELIMINAR
Y
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 P27 to P20
of port P2 (4 pins of P23 to P20 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 00D916). 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 00DA16) 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
s at f(XIN)= 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 00DA16)
Switch tree
Ladder resistor
A-D conversion
completion
interrupt request
VSS (Note 1)
VREF
1 : AVSS for the 44P6N package of the 7481 group.
2 : The 7480 group is not provided with P2 4/IN4 to P27/IN7.
P20/IN0
P21/IN1
P22/IN2
P23/IN3
P24/IN4
P25/IN5
P26/IN6
P27/IN7
Data bus
A-D control register
(address 00D916)
b4
b0
Channel
selector
Notes
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37481M8-XXXSP | 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 |
| M37481MT-088FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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