參數(shù)資料
型號： M38503E6SP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, 1.78 MM PITCH, PLASTIC, DIP-42
文件頁數(shù)： 16/52頁
文件大?。?/td> 806K
代理商： M38503E6SP
23
3850 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
A-D CONVERTER
[A-D Conversion Registers (ADL, ADH)]
003516, 003616
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)] 003416
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
AVSS and VREF into 1024 and outputs the divided voltages.
Channel Selector
The channel selector selects one of ports P30/AN0 to P34/AN4 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(XIN) to 500 kHz or more during an A-D conversion.
Fig. 24 Structure of AD control register
Fig. 25 Structure of A-D conversion registers
AD control register
(ADCON : address 003416)
Analog input pin selection bits
0 0 0: P30/AN0
0 0 1: P31/AN1
0 1 0: P32/AN2
0 1 1: P33/AN3
1 0 0: P34/AN4
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
b2 b1 b0
10-bit reading
(Read address 003616 before 003516)
(Address 003616)
(Address 003516)
8-bit reading (Read only address 003516)
(Address 003516)
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
Channel
selector
A-D control circuit
A-D conversion low-order register
Resistor ladder
VREF AVSS
Comparator
A-D interrupt request
b7
b0
3
10
P30/AN0
P31/AN1
P32/AN2
P33/AN3
P34/AN4
Data bus
AD control register
A-D conversion high-order register
(Address 0034 16)
(Address 0036 16)
(Address 0035 16)
Fig. 26 Block diagram of A-D converter
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