ATmega32A Datasheet - Sunrom Technologies

ATmega32A21.3 Register Description21.3.1 SFIOR – Special Function IO Register21-1. If ACME is cleared or ADEN is set, AIN1 is applied to the negative input to the AnalogComparator.Table 21-1.Analog Comparator Multiplexed InputACME ADEN MUX2:0 Analog Comparator Negative Input0 x xxx AIN11 1 xxx AIN11 0 000 ADC01 0 001 ADC11 0 010 ADC21 0 011 ADC31 0 100 ADC41 0 101 ADC51 0 110 ADC61 0 111 ADC7Bit 7 6 5 4 3 2 1 0ADTS2 ADTS1 ADTS0 – ACME PUD PSR2 PSR10 SFIORRead/Write R/W R/W R/W R R/W R/W R/W R/WInitial Value 0 0 0 0 0 0 0 0• Bit 3 – ACME: Analog Comparator Multiplexer EnableWhen this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is zero), theADC multiplexer selects the negative input to the Analog Comparator. When this bit is writtenlogic zero, AIN1 is applied to the negative input of the Analog Comparator. For a detaileddescription of this bit, see “Analog Comparator Multiplexed Input” on page 205.21.3.2 ACSR – Analog Comparator Control and Status RegisterBit 7 6 5 4 3 2 1 0ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 ACSRRead/Write R/W R/W R R/W R/W R/W R/W R/WInitial Value 0 0 N/A 0 0 0 0 0• Bit 7 – ACD: Analog Comparator DisableWhen this bit is written logic one, the power to the Analog Comparator is switched off. This bitcan be set at any time to turn off the Analog Comparator. This will reduce power consumption inactive and Idle mode. When changing the ACD bit, the Analog Comparator Interrupt must bedisabled by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when the bit ischanged.8155C–AVR–02/11207