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ATmega169P 数据表(PDF) 212 Page - ATMEL Corporation |
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ATmega169P 数据表(HTML) 212 Page - ATMEL Corporation |
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212 / 393 page  212 8018N–AVR–08/09 ATmega169P 21.1 Analog Comparator Multiplexed Input It is possible to select any of the ADC7:0 pins to replace the negative input to the Analog Com- parator. The ADC multiplexer is used to select this input, and consequently, the ADC must be switched off to utilize this feature. If the Analog Comparator Multiplexer Enable bit (ACME in ADCSRB) is set and the ADC is switched off (ADEN in ADCSRA is zero), MUX2:0 in ADMUX select the input pin to replace the negative input to the Analog Comparator, as shown in Table 21-1. If ACME is cleared or ADEN is set, AIN1 is applied to the negative input to the Analog Comparator. Table 21-1. Analog Comparator Multiplexed Input ACME ADEN MUX2:0 Analog Comparator Negative Input 0 x xxx AIN1 1 1 xxx AIN1 1 0 000 ADC0 1 0 001 ADC1 1 0 010 ADC2 1 0 011 ADC3 1 0 100 ADC4 1 0 101 ADC5 1 0 110 ADC6 1 0 111 ADC7 |
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