atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 326

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

326
ATmega32U4
(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.
Table 25-3.
• 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-
sions. For a complete description of this bit, see
page
• Bits 4:0 – MUX4:0: Analog Channel Selection Bits
The value of these bits selects which combination of analog inputs are connected to the ADC.
These bits also select the gain for the differential channels. See
bits are changed during a conversion, the change will not go in effect until this conversion is
complete (ADIF in ADCSRA is set).
Table 25-4.
MUX5..0
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
REFS1
0
0
1
1
329.
(1)
REFS0
0
1
0
1
Single Ended
Input
ADC0
ADC1
N/A
ADC4
ADC5
ADC6
ADC7
N/A
Voltage Reference Selections for ADC
Input Channel and Gain Selections
Voltage Reference Selection
AREF, Internal Vref turned off
AV
Reserved
Internal 2.56V Voltage Reference with external capacitor on AREF pin
CC
with external capacitor on AREF pin
Positive Differential
Input
N/A
N/A
ADC1
N/A
ADC1
N/A
ADC0
“The ADC Data Register – ADCL and ADCH” on
Negative Differential
Input
N/A
ADC0
N/A
ADC0
ADC1
Table 25-4
for details. If these
7766A–AVR–03/08
Gain
N/A
10x
N/A
200x
1x