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ATMEGA161-4PC Datasheet(PDF) 81 Page - ATMEL Corporation |
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ATMEGA161-4PC Datasheet(HTML) 81 Page - ATMEL Corporation |
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81 / 159 page  81 ATmega161(L) 1228D–AVR–02/07 Analog Comparator The Analog Comparator compares the input values on the positive input PB2 (AIN0) and negative input PB3 (AIN1). When the voltage on the positive input PB2 (AIN0) is higher than the voltage on the negative input PB3 (AIN1), the Analog Comparator Output (ACO) is set (one). 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 compar- ator output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown in Figure 48. Figure 48. Analog Comparator Block Diagram Analog Comparator Control and Status Register – ACSR •Bit 7 – ACD: Analog Comparator Disable When this bit is set (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 con- sumption in active and Idle mode. When changing 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 – AINBG: Analog Comparator Bandgap Select When this bit is set, a fixed bandgap voltage of 1.22 ± 0.05V replaces the normal input to the positive input (AIN0) of the comparator. When this bit is cleared, the normal input pin PB2 is applied to the positive input of the comparator. •Bit 5 – ACO: Analog Comparator Output ACO is directly connected to the comparator output. Bit 7 65 432 10 $08 ($28) ACD AINBG 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 |
Similar Part No. - ATMEGA161-4PC |
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Similar Description - ATMEGA161-4PC |
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