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參數(shù)資料
| 型號： | M37225ECSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 76/128頁 |
| 文件大?。?/td> | 1481K |
| 代理商： | M37225ECSP |
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M37225M6/M8/MA/MC-XXXSP, M37225ECSP
Rev.1.00
Nov 01, 2000
page 49 of 124
REJ03B0136-0100Z
8.8 A-D CONVERTER
8.8.1 A-D Conversion Register (AD)
A-D conversion reigister is a read-only register that stores the result
of an A-D conversion. This register should not be read during A-D
conversion.
8.8.2 A-D Control Register (ADCON)
The A-D control register controls A-D conversion. Bits 2 to 0 of this
register select analog input pins. When these pins are not used as
anlog input pins, they are used as ordinary I/O pins. Bit 3 is the A-D
conversion completion bit, A-D conversion is started by writing “0” to
this bit. The value of this bit remains at “0” during an A-D conversion,
then changes to “1” when the A-D conversion is completed.
Bit 4 controls connection between the resistor ladder and VCC. When
not using the A-D converter, the resistor ladder can be cut off from
the internal VCC by setting this bit to “0,” accordingly providing low-
power dissipation.
8.8.3 Comparison Voltage Generator (Resistor
Ladder)
The voltage generator divides the voltage between VSS and VCC by
256, and outputs the divided voltages to the comparator as the refer-
ence voltage Vref.
8.8.4 Channel Selector
The channel selector connects an analog input pin, selected by bits
2 to 0 of the A-D control register, to the comparator.
8.8.5 Comparator and Control Circuit
The conversion result of the analog input voltage and the reference
voltage “Vref” is stored in the A-D conversion register. The A-D con-
version completion bit and A-D conversion interrupt request bit are
set to “1” at the completion of A-D conversion.
Fig. 8.8.1 A-D Converter Block Diagram
A-D control register
(address 00DF16)
A-D control circuit
Data bus
Switch tree
A-D conversion
interrupt request
Resistor ladder
Compa-
rator
C
h
a
n
e
l
s
e
le
c
to
r
A-D conversion register
A-D1
A-D2
A-D3
A-D4
(address 00DE16)
b7
b0
3
8
VSS VCC
A-D5
A-D6
A-D7
A-D8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| M37225MA | 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 |
| M372429100 | 制造商:ITW Switches 功能描述:IN-RUSH |
| M372429200 | 制造商:ITW Switches 功能描述:IN-RUSH |
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