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    參數(shù)資料
    型號(hào): PIC16C57-HSI/SP
    廠商: Microchip Technology
    文件頁數(shù): 77/194頁
    文件大?。?/td> 0K
    描述: IC MCU OTP 2KX12 28DIP
    產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
    標(biāo)準(zhǔn)包裝: 15
    系列: PIC® 16C
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    外圍設(shè)備: POR,WDT
    輸入/輸出數(shù): 20
    程序存儲(chǔ)器容量: 3KB(2K x 12)
    程序存儲(chǔ)器類型: OTP
    RAM 容量: 72 x 8
    電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 28-DIP(0.300",7.62mm)
    包裝: 管件
    配用: DVA16XP280-ND - ADAPTER DEVICE FOR MPLAB-ICE
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    PIC18F2450/4450
    DS39760A-page 166
    Advance Information
    2006 Microchip Technology Inc.
    15.2.4
    AUTO-WAKE-UP ON SYNC BREAK
    CHARACTER
    During Sleep mode, all clocks to the EUSART are
    suspended. Therefore, the Baud Rate Generator is
    inactive
    and
    proper
    byte
    reception
    cannot
    be
    performed. The auto-wake-up feature allows the
    controller to wake-up due to activity on the RX/DT line
    while the EUSART is operating in Asynchronous mode.
    The auto-wake-up feature is enabled by setting the
    WUE bit (BAUDCON<1>). Once set, the typical receive
    sequence on RX/DT is disabled and the EUSART
    remains in an Idle state, monitoring for a wake-up event
    independent of the CPU mode. A wake-up event
    consists of a high-to-low transition on the RX/DT line.
    (This coincides with the start of a Sync Break or a
    Wake-up Signal character for the LIN protocol.)
    Following a wake-up event, the module generates an
    RCIF
    interrupt.
    The
    interrupt
    is
    generated
    synchronously to the Q clocks in normal operating
    modes (Figure 15-8) and asynchronously if the device
    is in Sleep mode (Figure 15-9). The interrupt condition
    is cleared by reading the RCREG register.
    The WUE bit is automatically cleared once a low-to-high
    transition is observed on the RX line following the wake-
    up event. At this point, the EUSART module is in Idle
    mode and returns to normal operation. This signals to
    the user that the Sync Break event is over.
    15.2.4.1
    Special Considerations Using
    Auto-Wake-up
    Since auto-wake-up functions by sensing rising edge
    transitions on RX/DT, information with any state
    changes before the Stop bit may signal a false End-of-
    Character and cause data or framing errors. To work
    properly,
    therefore,
    the
    initial
    character
    in
    the
    transmission must be all ‘0’s. This can be 00h (8 bytes)
    for standard RS-232 devices or 000h (12 bits) for LIN
    bus.
    Oscillator start-up time must also be considered,
    especially in applications using oscillators with longer
    start-up intervals (i.e., XT or HS mode). The Sync
    Break (or Wake-up Signal) character must be of
    sufficient length and be followed by a sufficient interval
    to allow enough time for the selected oscillator to start
    and provide proper initialization of the EUSART.
    15.2.4.2
    Special Considerations Using
    the WUE Bit
    The timing of WUE and RCIF events may cause some
    confusion when it comes to determining the validity of
    received data. As noted, setting the WUE bit places the
    EUSART in an Idle mode. The wake-up event causes
    a receive interrupt by setting the RCIF bit. The WUE bit
    is cleared after this when a rising edge is seen on RX/
    DT. The interrupt condition is then cleared by reading
    the RCREG register. Ordinarily, the data in RCREG will
    be dummy data and should be discarded.
    The fact that the WUE bit has been cleared (or is still
    set) and the RCIF flag is set should not be used as an
    indicator of the integrity of the data in RCREG. Users
    should consider implementing a parallel method in
    firmware to verify received data integrity.
    To assure that no actual data is lost, check the RCIDL
    bit to verify that a receive operation is not in process. If
    a receive operation is not occurring, the WUE bit may
    then be set just prior to entering the Sleep mode.
    FIGURE 15-8:
    AUTO-WAKE-UP BIT (WUE) TIMINGS DURING NORMAL OPERATION
    FIGURE 15-9:
    AUTO-WAKE-UP BIT (WUE) TIMINGS DURING SLEEP
    Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
    OSC1
    WUE bit(1)
    RX/DT Line
    RCIF
    Note 1: The EUSART remains in Idle while the WUE bit is set.
    Bit set by user
    Auto-Cleared
    Cleared due to user read of RCREG
    Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
    Q1
    Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
    OSC1
    WUE bit(2)
    RX/DT Line
    RCIF
    Sleep Command Executed
    Note 1:
    If the wake-up event requires long oscillator warm-up time, the auto-clear of the WUE bit can occur while the
    stposc signal is still active.
    This sequence should not depend on the presence of Q clocks.
    2:
    The EUSART remains in Idle while the WUE bit is set.
    Sleep Ends
    Auto-Cleared
    Note 1
    Cleared due to user read of RCREG
    Bit set by user
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