參數(shù)資料
型號(hào)： M37225M8
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
中文描述： 單芯片8位CMOS微機(jī)電壓合成與屏幕顯示控制器
文件頁(yè)數(shù)： 49/133頁(yè)
文件大?。?/td> 1610K
代理商： M37225M8
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49
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37225M6–XXXSP, M37225M8–XXXSP
M37225ECSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
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 V
CC
. When
not using the A-D converter, the resistor ladder can be cut off from
the internal V
CC
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 V
SS
and V
CC
by
256, and outputs the divided voltages to the comparator as the refer-
ence voltage V
ref
.
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 “V
ref
” 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
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