ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 208
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ATMEGA8A-AUR
Manufacturer Part Number
ATMEGA8A-AUR
Description
MCU AVR 8KB FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Part Number
Manufacturer
Quantity
Price
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22.8
22.8.1
8159D–AVR–02/11
Register Description
ADMUX – ADC Multiplexer Selection Register – ADMUX
where V
Table 22-2 on page 208
represents the selected reference voltage minus one LSB.
• Bit 7:6 – REFS1:0: Reference Selection Bits
These bits select the voltage reference for the ADC, as shown in
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.
Table 22-2.
• 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 3:0 – MUX3:0: Analog Channel Selection Bits
The value of these bits selects which analog inputs are connected to the ADC. See
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).
Bit
Read/Write
Initial Value
REFS1
0
0
1
1
210.
IN
is the voltage on the selected input pin and V
REFS0
REFS1
Voltage Reference Selections for ADC
R/W
0
1
0
1
7
0
Voltage Reference Selection
AREF, Internal V
AV
Reserved
Internal 2.56V Voltage Reference with external capacitor at AREF pin
REFS0
R/W
6
0
CC
and
with external capacitor at AREF pin
Table 22-3 on page
ADLAR
R/W
5
0
ref
turned off
R
4
–
0
“ADCL and ADCH – The ADC Data Register” on
MUX3
209). 0x000 represents ground, and 0x3FF
R/W
3
0
REF
the selected voltage reference (see
MUX2
R/W
2
0
Table
MUX1
R/W
1
0
22-2. If these bits are
ATmega8A
MUX0
R/W
0
0
Table 22-3
ADMUX
208
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