AT90PWM2 datasheet(256/365 Pages) ATMEL

256 / 365 page

256

AT90PWM2/3

4317B–AVR–02/05

Example 1:

–

ADMUX = 0xED (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.

Example 2:

–

ADMUX = 0xFB (ADC3 - ADC2, 1x gain, 2.56V reference, left adjusted result)

–

Voltage on ADC3 is 300 mV, voltage on ADC2 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.

Table 99. Correlation Between Input Voltage and Output Codes

ADCn

Read code

Corresponding decimal value

VADCm + VREF /GAIN

0x1FF

511

ADCm + 0.999 VREF /GAIN

0x1FF

511

ADCm + 0.998 VREF /GAIN

0x1FE

510

...

ADCm + 0.001 VREF /GAIN

0x001

ADCm

0x000

ADCm - 0.001 VREF /GAIN

0x3FF

-1

...

ADCm - 0.999 VREF /GAIN

0x201

-511

ADCm - VREF /GAIN

0x200

-512

AT90PWM2 Datasheet(PDF) 256 Page - ATMEL Corporation

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