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ATmega16U4 Datasheet(PDF) 308 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) 308 Page - ATMEL Corporation

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7766D–AVR–01/09
ATmega16U4/ATmega32U4
Example 1:
– ADMUX = 0xE9, MUX5 = 0 (ADC1 - ADC0, 10x gain, 2.56V reference, left adjusted
result)
– Voltage on ADC1 is 300 mV, voltage on ADC0 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.
Example 2:
– ADMUX = 0xF0, MUX5 = 0 (ADC0 - ADC1, 1x gain, 2.56V reference, left adjusted
result)
– Voltage on ADC0 is 300 mV, voltage on ADC1 is 500 mV.
– ADCR = 512 * 1 * (300 - 500) / 2560 = -41 = 0x029.
– ADCL will thus read 0x40, and ADCH will read 0x0A.
Writing zero to ADLAR right adjusts the result: ADCL = 0x00, ADCH = 0x29.
24.9
ADC Register Description
24.9.1
ADC Multiplexer Selection Register – ADMUX
• Bit 7:6 – REFS1:0: Reference Selection Bits
These bits select the voltage reference for the ADC, as shown in Table 24-3. If these bits are
changed during a conversion, the change will not go in effect until this conversion is complete
Table 24-2.
Correlation Between Input Voltage and Output Codes
V
ADCn
Read code
Corresponding decimal value
V
ADCm + VREF /GAIN
0x1FF
511
VADCm + 0.999 VREF /GAIN
0x1FF
511
V
ADCm + 0.998 VREF /GAIN
0x1FE
510
...
...
...
VADCm + 0.001 VREF /GAIN
0x001
1
V
ADCm
0x000
0
VADCm - 0.001 VREF /GAIN
0x3FF
-1
...
...
...
V
ADCm - 0.999 VREF /GAIN
0x201
-511
VADCm - VREF /GAIN
0x200
-512
Bit
765
4321
0
REFS1
REFS0
ADLAR
MUX4
MUX3
MUX2
MUX1
MUX0
ADMUX
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
000
0000
0



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