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ATmega16U4 Datasheet(PDF) 309 Page - ATMEL Corporation

Part # ATmega16U4
Description  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16U4 Datasheet(HTML) 309 Page - ATMEL Corporation

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309
7766D–AVR–01/09
ATmega16U4/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.
•
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 “The ADC Data Register – ADCL and ADCH” on
page 312.
• 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 Table 24-4 for details. 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).
Table 24-3.
Voltage Reference Selections for ADC
REFS1
REFS0
Voltage Reference Selection
0
0
AREF, Internal Vref turned off
01
AVCC with external capacitor on AREF pin
10
Reserved
1
1
Internal 2.56V Voltage Reference with external capacitor on AREF pin
Table 24-4.
Input Channel and Gain Selections
MUX5..0(1)
Single Ended
Input
Positive Differential
Input
Negative Differential
Input
Gain
000000
ADC0
N/A
000001
ADC1
000010
N/A
000011
000100
ADC4
000101
ADC5
000110
ADC6
000111
ADC7
001000
N/A
N/A
N/A
N/A
001001
ADC1
ADC0
10x
001010
N/A
N/A
N/A
001011
ADC1
ADC0
200x
001100
N/A
001101
001110
001111
010000
ADC0
ADC1
1x



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