參數(shù)資料
型號(hào)： MR80C52XXX-36P883R
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁數(shù)： 53/132頁
文件大?。?/td> 10886K
代理商： MR80C52XXX-36P883R
219
ATmega8535(L)
2502K–AVR–10/06
Example:
ADMUX = 0xED (ADC3 - ADC2, 10x gain, 2.56V reference, left adjusted result)
Voltage on ADC3 is 300 mV, voltage on ADC2 is 500 mV.
ADCR = 512 * 10 * (300 - 500)/2560 = -400 = 0x270
ADCL will thus read 0x00, and ADCH will read 0x9C. Writing zero to ADLAR right
adjusts the result: ADCL = 0x70, ADCH = 0x02.
ADC Multiplexer Selection
Register – ADMUX
Bit 7:6 – REFS1:0: Reference Selection Bits
These bits select the voltage reference for the ADC, as shown in Table 84. If these bits
are changed during a conversion, the change will not go in effect until this conversion is
complete (ADIF in ADCSRA is set). The internal voltage reference options may not be
used if an external reference voltage is being applied to the AREF pin.
Bit 5 – ADLAR: ADC Left Adjust Result
The ADLAR bit affects the presentation of the ADC conversion result in the ADC Data
Register. Write one to ADLAR to left adjust the result. Otherwise, the result is right
adjusted. Changing the ADLAR bit will affect the ADC Data Register immediately,
regardless of any ongoing conversions. For a complete description of this bit, see “The
Table 83. Correlation Between Input Voltage and Output Codes
V
ADCn
Read Code
Corresponding Decimal Value
V
ADCm + VREF/GAIN
0x1FF
511
VADCm + (511/512) VREF/GAIN
0x1FF
511
V
ADCm + (510/512) VREF/GAIN
0x1FE
510
...
VADCm + (1/512) VREF/GAIN
0x001
1
V
ADCm
0x000
0
VADCm - (1/512) VREF/GAIN
0x3FF
-1
...
V
ADCm - (511/512) VREF/GAIN
0x201
-511
VADCm - VREF/GAIN
0x200
-512
Bit
7654
321
0
REFS1
REFS0
ADLAR
MUX4
MUX3
MUX2
MUX1
MUX0
ADMUX
Read/Write
R/W
Initial Value
0000
000
0
Table 84. Voltage Reference Selections for ADC
REFS1
REFS0
Voltage Reference Selection
0
AREF, Internal Vref turned off
0
1
AVCC with external capacitor at AREF pin
10
Reserved
1
Internal 2.56V Voltage Reference with external capacitor at AREF pin
相關(guān)PDF資料
PDF描述
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