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ATmega169P Datasheet(PDF) 227 Page - ATMEL Corporation |
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ATmega169P Datasheet(HTML) 227 Page - ATMEL Corporation |
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227 / 393 page  227 8018N–AVR–08/09 ATmega169P ADMUX = 0xFB (ADC3 - ADC2, 1.1V reference, left adjusted result) Voltage on ADC3 is 300 mV, voltage on ADC2 is 500 mV. ADCR = 512 * (300 - 500) / 1100 = -93 = 0x3A3 . ADCL will thus read 0xC0, and ADCH will read 0xD8. Writing zero to ADLAR right adjusts the result: ADCL = 0xA3, ADCH = 0x03. Table 22-2. Correlation Between Input Voltage and Output Codes V ADCn Read Code Corresponding Decimal Value V ADCm + VREF 0x1FF 511 VADCm + 511/ 512 VREF 0x1FF 511 V ADCm + 510/ 512 VREF 0x1FE 510 ... ... ... VADCm + 1/ 512 VREF 0x001 1 V ADCm 0x000 0 VADCm - 1/ 512 VREF 0x3FF -1 ... ... ... V ADCm - 511/ 512 VREF 0x201 -511 VADCm - VREF 0x200 -512 |
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