參數(shù)資料
    型號(hào): M38231GD-XXXFP
    廠商: Renesas Technology Corp.
    英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    中文描述: 單芯片8位CMOS微機(jī)
    文件頁(yè)數(shù): 49/76頁(yè)
    文件大?。?/td> 896K
    代理商: M38231GD-XXXFP
    Rev.2.02 Jun 19, 2007 page 49 of 73
    REJ03B0146-0202
    3823 Group
    PERIPHERAL FUNCTION EXTENSION REGISTER
    The serial I/O transfer direction can be switched by setting the bit
    0 in the peripheral function expansion register to “1”. This function
    is valid only when the bit 6 in the serial I/O control register is set to
    “1” (when the clock synchronous serial I/O is selected). P4
    7
    can
    be selected as the output pin of the clock synchronous serial I/O
    by setting the bit 1 in the peripheral function expansion register to
    “1”. When setting P4
    7
    to the S
    OUT
    pin, set the bit 7 in the port P4
    direction register to “1”. This function is valid only when the bit 6 in
    the serial I/O control register to “1” (when the clock synchronous
    serial I/O is selected). P-channel output of T
    X
    D and S
    OUT
    can be
    disabled by the bits 2 and 3 in the peripheral function expansion
    register. Set the bit 4 in the UART control register to “1” after se-
    lecting the pin to disable the P-channel output. X
    CIN
    frequency
    signal can be output from the port P4
    1
    by setting the bit 4 in the
    peripheral function expansion register to “1”. Set the bit 0 in the
    φ
    output control register and the bit 1 in the port P4 direction regis-
    ter to “1” to output the X
    CIN
    frequency signal.
    Fig. 50 Structure of peripheral function extension register
    Transfer direction selection bit (valid when UART is used)
    0 : LSB first
    1 : MSB first
    Synchronous serial I/O output pin selection bit
    0:P4
    5
    /T
    X
    D pin
    1:P4
    7
    /S
    RDY
    /S
    OUT
    pin
    P-channel output disabled selection bit
    00: P4
    5
    /T
    X
    D pin
    01: The bit 4 in the UART control register is invalid
    10: P4
    5
    /T
    X
    D pin or P47/S
    RDY
    /S
    OUT
    pin
    11: P4
    7
    /S
    RDY
    /S
    OUT
    pin
    Output clock selection bit
    0:
    φ
    clock output
    1: X
    CIN
    frequency signal output
    Not used (returns “0” when read)
    (Do not write “1” to this bit)
    Peripheral function extension register (Address: 0030
    16
    )
    EXP
    b
    7
    b
    0
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