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  • 參數(shù)資料
    型號: PIC16LC77T-04I/L
    廠商: Microchip Technology
    文件頁數(shù): 11/114頁
    文件大小: 0K
    描述: IC MCU OTP 8KX14 A/D PWM 44PLCC
    標(biāo)準(zhǔn)包裝: 500
    系列: PIC® 16C
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 4MHz
    連通性: I²C,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 33
    程序存儲器容量: 14KB(8K x 14)
    程序存儲器類型: OTP
    RAM 容量: 368 x 8
    電壓 - 電源 (Vcc/Vdd): 2.5 V ~ 6 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-LCC(J 形引線)
    包裝: 帶卷 (TR)
    PIC16C7X
    DS30390E-page 108
    1997 Microchip Technology Inc.
    12.2.2
    USART ASYNCHRONOUS RECEIVER
    The receiver block diagram is shown in Figure 12-10.
    The data is received on the RC7/RX/DT pin and drives
    the data recovery block. The data recovery block is
    actually a high speed shifter operating at x16 times the
    baud rate, whereas the main receive serial shifter oper-
    ates at the bit rate or at FOSC.
    Once Asynchronous mode is selected, reception is
    enabled by setting bit CREN (RCSTA<4>).
    The heart of the receiver is the receive (serial) shift reg-
    ister (RSR). After sampling the STOP bit, the received
    data in the RSR is transferred to the RCREG register (if
    it is empty). If the transfer is complete, ag bit RCIF
    (PIR1<5>) is set. The actual interrupt can be enabled/
    disabled
    by
    setting/clearing
    enable
    bit
    RCIE
    (PIE1<5>). Flag bit RCIF is a read only bit which is
    cleared by the hardware. It is cleared when the RCREG
    register has been read and is empty. The RCREG is a
    double buffered register, i.e. it is a two deep FIFO. It is
    possible for two bytes of data to be received and trans-
    ferred to the RCREG FIFO and a third byte begin shift-
    ing to the RSR register. On the detection of the STOP
    bit of the third byte, if the RCREG register is still full
    then overrun error bit OERR (RCSTA<1>) will be set.
    The word in the RSR will be lost. The RCREG register
    can be read twice to retrieve the two bytes in the FIFO.
    Overrun bit OERR has to be cleared in software. This
    is done by resetting the receive logic (CREN is cleared
    and then set). If bit OERR is set, transfers from the
    RSR register to the RCREG register are inhibited, so it
    is essential to clear error bit OERR if it is set. Framing
    error bit FERR (RCSTA<2>) is set if a stop bit is
    detected as clear. Bit FERR and the 9th receive bit are
    buffered the same way as the receive data. Reading
    the RCREG, will load bits RX9D and FERR with new
    values, therefore it is essential for the user to read the
    RCSTA register before reading RCREG register in
    order not to lose the old FERR and RX9D information.
    FIGURE 12-10: USART RECEIVE BLOCK DIAGRAM
    FIGURE 12-11: ASYNCHRONOUS RECEPTION
    x64 Baud Rate CLK
    SPBRG
    Baud Rate Generator
    RC7/RX/DT
    Pin Buffer
    and Control
    SPEN
    Data
    Recovery
    CREN
    OERR
    FERR
    RSR register
    MSb
    LSb
    RX9D
    RCREG register
    FIFO
    Interrupt
    RCIF
    RCIE
    Data Bus
    8
    ÷ 64
    ÷ 16
    or
    Stop
    Start
    (8)
    7
    1
    0
    RX9
    Start
    bit
    bit7/8
    bit1
    bit0
    bit7/8
    bit0
    Stop
    bit
    Start
    bit
    Start
    bit
    bit7/8
    Stop
    bit
    RX (pin)
    reg
    Rcv buffer reg
    Rcv shift
    Read Rcv
    buffer reg
    RCREG
    RCIF
    (interrupt ag)
    OERR bit
    CREN
    WORD 1
    RCREG
    WORD 2
    RCREG
    Stop
    bit
    Note: This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after the third word,
    causing the OERR (overrun) bit to be set.
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