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  • 參數(shù)資料
    型號: MC68HC705CL48
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112
    封裝: TQFP-112
    文件頁數(shù): 108/145頁
    文件大?。?/td> 673K
    代理商: MC68HC705CL48
    June 11, 1997
    GENERAL RELEASE SPECIFICATION
    MC68HC05CL48
    TIMER
    MOTOROLA
    REV 2.0
    8-13
    IC1F - Input Capture Flag
    1 =
    Flag set when a selected polarity edge has been sensed by the
    input capture edge detector.
    0 =
    Flag cleared by reading the timer status register (with IC1F set)
    followed by accessing the low byte ($14) of the input capture
    register.
    IC2F - Input Capture Flag
    1 =
    Flag set when a selected polarity edge has been sensed by the
    input capture edge detector.
    0 =
    Flag cleared by reading the timer status register (with IC2F set)
    followed by accessing the low byte ($10) of the input capture
    register.
    OC1F - Output Compare 1 Flag
    1 =
    Flag set when the output compare register 1 contents matches the
    contents of the free running counter.
    0 =
    Flag cleared by reading the timer status register (with OC1F set)
    and then accessing the low byte ($16) of the output compare 1
    register.
    OC2F - Output Compare 2 Flag
    1 =
    Flag set when the output compare register 2 contents matches the
    contents of the free running counter.
    0 =
    Flag cleared by reading the timer status register (with OC2F set)
    and then accessing the low byte ($18) of the output compare 1
    register.
    TOF - Timer OVerow Flag
    1 =
    Flag set by transition of the free running counter from $FFFF to
    $0000.
    0 =
    Flag cleared by reading the timer status register (with TOF set)
    followed by an access of the free running counter least signicant
    byte ($1A).
    Accessing the timer status register satises the rst condition required to clear
    status bits. The remaining step is to access the register corresponding to the
    status bit.
    A problem can occur when using the timer overow function and reading the free-
    running counter at random times to measure an elapsed time. Without
    incorporating the proper precautions into software, the timer overow ag could
    unintentionally be cleared if:
    1.
    The timer status register is read or written when TOF is set, and
    2.
    The LSB of the free-running counter is read but not for the purpose of
    servicing the ag.
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