
221
8154B–AVR–07/09
ATmega16A
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.
22.9
Register Description
22.9.1
ADMUX – ADC Multiplexer Selection Register
Bit 7:6 – REFS1:0: Reference Selection Bits
These bits select the voltage reference for the ADC, as shown in
Table 22-3. 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 conver-
:.
V
ADCm + 1/512 VREF/GAIN
0x001
1
VADCm
0x000
0
V
ADCm - 1/512 VREF/GAIN
0x3FF
-1
:.
VADCm - 511/512 VREF/GAIN
0x201
-511
V
ADCm - VREF/GAIN
0x200
-512
Table 22-2.
Correlation between Input Voltage and Output Codes (Continued)
VADCn
Read code
Corresponding Decimal Value
Bit
765
432
10
REFS1
REFS0
ADLAR
MUX4
MUX3
MUX2
MUX1
MUX0
ADMUX
Read/Write
R/W
Initial Value
0
Table 22-3.
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