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ATmega165 Datasheet(PDF) 201 Page - ATMEL Corporation |
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ATmega165 Datasheet(HTML) 201 Page - ATMEL Corporation |
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201 / 336 page  201 ATmega165/V 2573G–AVR–07/09 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. 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 82. 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). The internal voltage reference options may not be used if an external reference voltage is being applied to the AREF pin. • 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 conversions. For a complete description of this bit, see “The ADC Data Register – ADCL and ADCH” on page 204. Table 81. 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 Bit 7654 321 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 0000 000 0 Table 82. Voltage Reference Selections for ADC REFS1 REFS0 Voltage Reference Selection 0 0 AREF, Internal Vref turned off 0 1 AVCC with external capacitor at AREF pin 10 Reserved 1 1 Internal 1.1V Voltage Reference with external capacitor at AREF pin |
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