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  • 參數(shù)資料
    型號: MC9S12C96PVPB25
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP52
    封裝: LQFP-52
    文件頁數(shù): 16/138頁
    文件大?。?/td> 2318K
    代理商: MC9S12C96PVPB25
    Device User Guide — 9S12C128DGV1/D V01.07
    110
    B.6.1.4 External Reset
    When external reset is asserted for a time greater than PWRSTL the CRG module generates an internal
    reset, and the CPU starts fetching the reset vector without doing a clock quality check, if there was an
    oscillation before reset.
    B.6.1.5 Stop Recovery
    Out of STOP the controller can be woken up by an external interrupt. A clock quality check as after POR
    is performed before releasing the clocks to the system.
    B.6.1.6 Pseudo Stop and Wait Recovery
    The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in
    both modes. In Pseudo Stop Mode the voltage regulator is switched to reduced performance mode to
    reduce power consumption. The returning out of pseudo stop to full perfomance takes tvup. The controller
    can be woken up by internal or external interrupts.After twrs in Wait or tvup+twrs in Pseudo Stop the CPU
    starts fetching the interrupt vector.
    B.6.2 Oscillator
    The device features an internal Colpitts and Pierce oscillator. The selection of Colpitts oscillator or Pierce
    oscillator/external clock depends on the XCLKS signal which is sampled during reset. Pierce
    oscillator/external clock mode allows the input of a square wave. Before asserting the oscillator to the
    internal system clocks the quality of the oscillation is checked for each start from either power-on, STOP
    or oscillator fail. tCQOUT specifies the maximum time before switching to the internal self clock mode after
    POR or STOP if a proper oscillation is not detected. The quality check also determines the minimum
    F
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    Freescale Semiconductor, Inc.
    For More Information On This Product,
    Go to: www.freescale.com
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