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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 227 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 227 Page - ATMEL Corporation |
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227 / 386 page  227 2467S–AVR–07/09 ATmega128 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 107 . Figure 107. Analog Comparator Block Diagram Notes: 1. See Table 94 on page 229. 2. Refer to Figure 1 on page 2 and Table 39 on page 81 for Analog Comparator pin placement. Special Function IO Register – SFIOR • Bit 3 – 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 228. Analog Comparator Control and Status Register – ACSR • 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 changing the ACD bit, the Analog Comparator Interrupt must be ACBG BANDGAP REFERENCE ADC MULTIPLEXER OUTPUT ACME ADEN 1) Bit 7 6 5 4 3 2 1 0 TSM – – – ACME PUD PSR0 PSR321 SFIOR Read/Write R/W R R R R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 765 4321 0 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 0000 0 |
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