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參數(shù)資料
| 型號(hào)： | M37224M3 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機(jī)) |
| 中文描述： | 單芯片8位單片機(jī)（8位單片機(jī)） |
| 文件頁(yè)數(shù)： | 30/83頁(yè) |
| 文件大?。?/td> | 901K |
| 代理商： | M37224M3 |
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M37224M3-XXXSP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
30
A-D COMPARATOR
A-D comparator consists of 6-bit D-A converter and comparator. A-D
comparator block diagram is shown in Figure 27.
The reference voltage “V
ref
” for D-A conversion is set by bits 0 to 5 of
the A-D control register 2 (address 00EF
16
).
The comparison result of the analog input voltage and the reference
voltage “V
ref
” is stored in bit 4 of the A-D control register 1 (address
00EE
16
).
For A-D comparison, set “0” to corresponding bits of the direction
register to use ports as analog input pins. Write the data for select of
analog input pins to bits 0 to 2 of the A-D control register 1 and write
the digital value corresponding to V
ref
to be compared to the bits 0
to 5 of the A-D control register 2. The voltage comparison starts by
writing to the A-D control register 2, and it is completed after 16 ma-
chine cycles (NOP instruction
8).
A-D Control Register 2
Bit 4
0
0
0
0
Bit 1
0
0
1
0
1
1
Bit 0
0
1
0
1
0
1
Table 3. Relation between Contents of A-D Control Register 2 and
Reference Voltage “V
ref
”
1
1
1
Bit 3
0
0
1
1
1
Bit 2
0
0
0
1
1
1
Bit 5
0
0
0
1
1
1
1/128 V
CC
3/128 V
CC
5/128 V
CC
123/128 V
CC
125/128 V
CC
127/128 V
CC
Reference
Voltage “V
ref
”
…
…
…
…
…
…
…
Fig. 27. A-D Comparator Block Diagram
A-D control register 1
Bits 0 to 2
Comparator control
Data bus
Bit 4
Switch tree
A-D control
register 2
Resistor ladder
Compa-
rator
Analog
signal
switch
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
A-D control
register 1
A-D1
A-D2
A-D3
A-D4
A-D5
A-D6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37224M3-050SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37224M3-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37225ECSP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37225M6 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37225M8 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
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