參數(shù)資料
型號(hào)： M38512M4
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 33/61頁(yè)
文件大小： 904K
代理商： M38512M4
33
3851 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
A-D CONVERTER
[A-D Conversion Registers (ADL, ADH)]
0035
16
, 0036
16
The A-D conversion registers are read-only registers that store the
result of an A-D conversion. Do not read these registers during an
A-D conversion
[AD Control Register (ADCON)] 0034
16
The AD control register controls the A-D conversion process. Bits
0 to 2 select a specific analog input pin. Bit 4 indicates the
completion of an A-D conversion. The value of this bit remains at
“0” during an A-D conversion and changes to “1” when an A-D
conversion ends. Writing “0” to this bit starts the A-D conversion.
Comparison Voltage Generator
The comparison voltage generator divides the voltage between
AV
SS
and V
REF
into 1024 and outputs the divided voltages.
Channel Selector
The channel selector selects one of ports P3
0
/AN
0
to P3
4
/AN
4
and
inputs the voltage to the comparator.
Comparator and Control Circuit
The comparator and control circuit compare an analog input volt-
age with the comparison voltage, and the result is stored in the
A-D conversion registers. When an A-D conversion is completed,
the control circuit sets the A-D conversion completion bit and the
A-D interrupt request bit to “1”.
Note that because the comparator consists of a capacitor cou-
pling, set f(X
IN
) to 500 kHz or more during an A-D conversion.
Fig. 36 Structure of AD control register
Fig. 37 Structure of A-D conversion registers
AD control register
(ADCON : address 0034
16
)
Analog input pin selection bits
b2 b1 b0
0 0 0: P3
0
/AN
0
0 0 1: P3
1
/AN
1
0 1 0: P3
2
/AN
2
0 1 1: P3
3
/AN
3
1 0 0: P3
4
/AN
4
Not used (returns “0” when read)
A-D conversion completion bit
0: Conversion in progress
1: Conversion completed
Not used (returns “0” when read)
b7
b0
10-bit reading
(Read address 0036
16
before 0035
16
)
(Address 0036
16
)
(Address 0035
16
)
8-bit reading (Read only address 0035
16
)
(Address 0035
16
)
b8
b7 b6 b5 b4 b3 b2 b1 b0
b7
b0
b9
b7
b0
Note :
The high-order 6 bits of address 0036
16
become “0”
at reading.
b9 b8 b7 b6 b5 b4 b3 b2
b7
b0
C
A-D control circuit
A-D conversion low-order register
Resistor ladder
V
REF
AV
SS
Comparator
A-D interrupt request
b7
b0
3
10
P3
0
/AN
0
P3
1
/AN
1
P3
2
/AN
2
P3
3
/AN
3
P3
4
/AN
4
Data bus
AD control register
(Address 0034
16
)
A-D conversion high-order register
(Address 0036
16
)
(Address 0035
16
)
Fig. 38 Block diagram of A-D converter
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