參數(shù)資料
型號： M37274MA
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)）
文件頁數(shù)： 30/131頁
文件大?。?/td> 2049K
代理商： M37274MA
30
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
A-D control register
(ADCON: address 00EF
16
)
A-D conversion completion bit
0 : Conversion in purogress
1 : Conversion completed
V
CC
connection selection bit
0 : OFF
1 : ON
Fix this bit to “0.”
Analog input pin selection bits
b2 b1 b0
0 0
0 : AD1
0 0 1 : AD2
0 1 0 : AD3
0 1 1 : AD4
1 0
0 : AD5
1 0 1 : AD6
1 1 0 :
1 1 1 :
0
7
Do not set.
A-D CONVERTER
(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.
(2)A-D Control Register (ADCON)
The A-D control register controls A-D conversion. Bits 1 and 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.
(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
.
(4)Channel Selector
The channel selector connects an analog input pin, selected by bits
1 and 0 of the A-D control register, to the comparator.
(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. 21. A-D Control Register
Fig. 22. A-D Comparator Block Diagram
A-D control register
(address 00EF
16
)
A-D control circuit
Data bus
Switch tree
A-D conversion
interrupt request
Resistor ladder
Compa-
rator
C
A-D conversion register
AD1
AD2
AD3
AD4
(address 00EE
16
)
b7
b0
2
8
V
SS
V
CC
AD5
AD6
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37274MA-052SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37274MA-053SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37274MA-082SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37274MA-084SP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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