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ATMEGA640 Datasheet(PDF) 266 Page - Microchip Technology |
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ATMEGA640 Datasheet(HTML) 266 Page - Microchip Technology |
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266 / 436 page  266 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A 25.2 Register Description 25.2.1 ADCSRB – ADC Control and Status Register B • Bit 6 – ACME: Analog Comparator Multiplexer Enable When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is zero), the ADC multiplexer selects the negative input to the Analog Comparator. When this bit is written logic zero, AIN1 is applied to the neg- ative input of the Analog Comparator. For a detailed description of this bit, see “Analog Comparator Multiplexed Input” on page 265. 25.2.2 ACSR – Analog Comparator Control and Status Register • Bit 7 – ACD: Analog Comparator Disable When this bit is written logic one, the power to the Analog Comparator is switched off. This bit can be set at any time to turn off the Analog Comparator. This will reduce power consumption in Active and Idle mode. When chang- ing the ACD bit, the Analog Comparator Interrupt must be disabled by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when the bit is changed. • Bit 6 – ACBG: Analog Comparator Bandgap Select When this bit is set, a fixed bandgap reference voltage replaces the positive input to the Analog Comparator. When this bit is cleared, AIN0 is applied to the positive input of the Analog Comparator. When the bandgap reference is used as input to the Analog Comparator, it will take a certain time for the voltage to stabilize. If not stabilized, the first conversion may give a wrong value. See “Internal Voltage Reference” on page 60. 100 100 ADC4 100 101 ADC5 100 110 ADC6 100 111 ADC7 101 000 ADC8 101 001 ADC9 101 010 ADC10 101 011 ADC11 101 100 ADC12 101 101 ADC13 101 110 ADC14 101 111 ADC15 Table 25-1. Analog Comparator Mulitiplexed Input (Continued) ACME ADEN MUX5 MUX2:0 Analog Comparator Negative Input Bit 7 6 543 210 (0x7B) – ACME – – MUX5 ADTS2 ADTS1 ADTS0 ADCSRB Read/Write R R/W R R R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 543 210 0x30 (0x50) ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 ACSR Read/Write R/W R/W R R/W R/W R/W R/W R/W Initial Value 0 0 N/A 0 0 0 0 0 |
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