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    參數(shù)資料
    型號(hào): MR83C154XXX-25/883D
    廠商: TEMIC SEMICONDUCTORS
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
    文件頁(yè)數(shù): 31/141頁(yè)
    文件大?。?/td> 7628K
    代理商: MR83C154XXX-25/883D
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    210
    8021G–AVR–03/11
    ATmega329P/3290P
    21. Analog Comparator
    21.1
    Overview
    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 21-1.
    The PRADC, in ”P(pán)RR – Power Reduction Register” on page 43 must be written to zero to use
    the ADC input MUX.
    Figure 21-1. Analog Comparator Block Diagram
    Note:
    2. Refer to Figure 1-2 on page 3 and Table 13-5 on page 72 for Analog Comparator pin
    placement.
    21.2
    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.
    ACBG
    BANDGAP
    REFERENCE
    ADC MULTIPLEXER
    OUTPUT
    ACME
    ADEN
    (1)
    Table 21-1.
    Analog Comparator Multiplexed Input
    ACME
    ADEN
    MUX2..0
    Analog Comparator Negative Input
    0
    x
    xxx
    AIN1
    1
    xxx
    AIN1
    1
    0
    000
    ADC0
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