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AT90USB646 Datasheet(PDF) 310 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 310 Page - ATMEL Corporation |
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310 / 459 page  310 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 24. Analog Comparator The Analog Comparator compares the input values on the positive pin AIN0 and negative pin AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on the negative pin AIN1, the Analog Comparator output, ACO, is set. The comparator’s output can be set to trigger the Timer/Counter1 Input Capture function. In addition, the comparator can trigger a separate interrupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on com- parator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown in Figure 24-1. The Power Reduction ADC bit, PRADC, in “Power Reduction Register 0 - PRR0” on page 54 must be disabled by writing a logical zero to be able to use the ADC input MUX. Figure 24-1. Analog Comparator Block Diagram (2) Notes: 1. See Table 24-2 on page 312. 2. Refer to Figure 1-1 on page 3 and Table 10-6 on page 80 for Analog Comparator pin placement. 24.0.1 ADC Control and Status Register B – ADCSRB • 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 negative input of the Analog Comparator. For a detailed description of this bit, see “Analog Comparator Multiplexed Input” on page 312. 24.0.2 Analog Comparator Control and Status Register – ACSR • Bit 7 – ACD: Analog Comparator Disable ACBG BANDGAP REFERENCE ADC MULTIPLEXER OUTPUT ACME ADEN (1) Bit 7 654 321 0 –ACME – – - ADTS2 ADTS1 ADTS0 ADCSRB Read/Write R R/W R R R R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 765 43 210 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 00N/A 00 000 |
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