ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 289
ATMEGA2561-16AI
Manufacturer Part Number
ATMEGA2561-16AI
Description
IC AVR MCU 256K 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA2561-16AI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
256KB (128K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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25.8
25.8.1
2549M–AVR–09/10
Register Description
ADMUX – ADC Multiplexer Selection Register
Table 25-2.
Example:
ADMUX = 0xFB (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.
• 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 25-3.
Note:
Bit
(0x7C)
Read/Write
Initial Value
V
V
V
...
V
V
V
...
V
V
V
ADCn
ADCm
ADCm
ADCm
ADCm
ADCm
ADCm
ADCm
REFS1
ADCm
0
0
1
1
+ 0.999 V
+ 0.998 V
+ 0.001 V
- 0.001 V
- 0.999 V
- V
+ V
1. If 10x or 200x gain is selected, only 2.56 V should be used as Internal Voltage Reference. For
REF
REF
differential conversion, only 1.1V cannot be used as internal voltage reference.
/ GAIN
/ GAIN
Correlation Between Input Voltage and Output Codes
Voltage Reference Selections for ADC
REFS0
REFS1
REF
REF
REF
REF
REF
R/W
7
0
0
1
0
1
/ GAIN
/ GAIN
/ GAIN
/ GAIN
/ GAIN
REFS0
R/W
Voltage Reference Selection
AREF, Internal V
AVCC with external capacitor at AREF pin
Internal 1.1V Voltage Reference with external capacitor at AREF pin
Internal 2.56V Voltage Reference with external capacitor at AREF pin
6
0
ATmega640/1280/1281/2560/2561
ADLAR
R/W
Read Code
0x1FF
0x1FF
0x1FE
...
0x001
0x000
0x3FF
...
0x201
0x200
5
0
REF
MUX4
R/W
turned off
4
0
MUX3
R/W
(1)
3
0
MUX2
R/W
Corresponding Decimal Value
2
0
Table
MUX1
R/W
1
0
25-3. If these bits are
-511
-512
511
511
510
...
-1
...
1
0
MUX0
R/W
0
0
ADMUX
289
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