參數(shù)資料
型號(hào)： M3727GM8-XXXSP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁數(shù)： 74/131頁
文件大?。?/td> 1130K
代理商： M3727GM8-XXXSP
M3727GM6/M8–XXXSP/FP M37272E8SP/FP
Rev.1.00
Apr 01, 2001
page 45 of 127
REJ03B0132-0100Z
8.8 A-D COMPARATOR
A-D comparator consists of 6-bit D-A converter and comparator. A-D
comparator block diagram is shown in Figure 8.8.1.
The reference voltage “Vref” for D-A conversion is set by bits 0 to 5 of
A-D control register 2 (address 00ED16).
The comparison result of the analog input voltage and the reference
voltage “Vref” is stored in bit 4 of A-D control register 1 (address
00EC16).
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 A-D control register 1 and write the
digital value corresponding to Vref to be compared to the bits 0
to 5 of A-D control register 2. The voltage comparison starts by writ-
ing to A-D control register 2, and it is completed after 16 machine
cycles (NOP instruction 8).
Fig. 8.8.1 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
AD1
AD2
AD3
AD4
AD5
AD6
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