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    參數(shù)資料
    型號: MC68HC11FC0CFU5
    廠商: MOTOROLA INC
    元件分類: 微控制器/微處理器
    英文描述: Technical Summary 8-Bit Microcontroller
    中文描述: 8-BIT, 6 MHz, MICROCONTROLLER, PQFP64
    封裝: QFP-64
    文件頁數(shù): 46/74頁
    文件大?。?/td> 513K
    代理商: MC68HC11FC0CFU5
    MOTOROLA
    MC68HC11F1/FC0
    50
    MC68HC11FTS/D
    10.2 SPI Registers
    U = Unaffected by reset
    SPIE — SPI Interrupt Enable
    When SPI interrupts are enabled, a hardware interrupt sequence is requested each time the SPIF or
    MODF status flag is set. SPI interrupts are inhibited if this bit is cleared or if the I bit in the condition code
    register is one.
    0 = SPI interrupt disabled
    1 = SPI interrupt enabled
    SPE — SPI Enable
    When the SPE bit is set, PD[5:2] are dedicated to the SPI function. If the SPI is in master mode and the
    DDRD bit 5 is set, then PD5/SS becomes a general-purpose output instead of the SS input.
    0 = SPI off
    1 = SPI on
    DWOM — Port D Wired-OR Mode Option for SPI Pins PD[5:2]
    0 = Normal CMOS outputs
    1 = Open-drain outputs
    MSTR — Master Mode Select
    0 = Slave mode
    1 = Master mode
    CPOL — Clock Polarity
    When the clock polarity bit is cleared and data is not being transferred, the SCK pin of the master device
    has a steady state low value. When CPOL is set, SCK idles high. Refer to Figure 13.
    CPHA — Clock Phase
    The clock phase bit, in conjunction with the CPOL bit, controls the clock-data relationship between mas-
    ter and slave. The CPHA bit selects one of two clocking protocols. Refer to Figure 13.
    Figure 13 SPI Data Clock Timing Diagram
    SPCR — SPI Control Register
    $x028
    Bit 7
    6
    5
    4
    3
    2
    1
    Bit 0
    SPIE
    SPE
    DWOM
    MSTR
    CPOL
    CPHA
    SPR1
    SPR0
    RESET:
    0
    1
    U
    SCK CYCLE #
    (FOR REFERENCE)
    12345678
    SCK (CPOL = 0)
    SCK (CPOL = 1)
    (CPHA = 0) DATA OUT
    (CPHA = 1) DATA OUT
    SS (TO SLAVE)
    SAMPLE INPUT
    MSB
    654321
    LSB
    MSB
    654321
    LSB
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