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  • 參數(shù)資料
    型號: M38279MBMXXXHP
    廠商: Mitsubishi Electric Corporation
    英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    中文描述: 單芯片8位CMOS微機(jī)
    文件頁數(shù): 29/70頁
    文件大?。?/td> 1112K
    代理商: M38279MBMXXXHP
    29
    SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    MITSUBISHI MICROCOMPUTERS
    3827 Group
    Serial I/O2
    The serial I/O2 function can be used only for clock synchronous
    serial I/O.
    For clock synchronous serial I/O2 the transmitter and the receiver
    must use the same clock. When the internal clock is used, transfer
    is started by a write signal to the serial I/O2 register.
    When an internal clock is selected as the synchronous clock of the
    serial I/O2, either P6
    2
    or P6
    3
    can be selected as an output pin of
    the synchronous clock. In this case, the pin that is not selected as
    an output pin of the synchronous clock functions as a port.
    [Serial I/O2 Control Register (SIO2CON)]
    001D
    16
    The serial I/O2 control register contains 8 bits which control vari-
    ous serial I/O2 functions.
    Fig. 26 Structure of serial I/O2 control register
    Serial I/O2 control register
    (SIO2CON : address 001D
    16
    )
    Internal synchronous clock select bits
    IN
    )/8 (f(X
    CIN
    )/8 in low-speed mode)
    0 0 1: f(X
    IN
    )/16 (f(X
    CIN
    )/16 in low-speed mode)
    0 1 0: f(X
    IN
    )/32 (f(X
    CIN
    )/32 in low-speed mode)
    0 1 1: f(X
    IN
    )/64 (f(X
    CIN
    )/64 in low-speed mode)
    1 0 0:
    1 0 1:
    1 1 0: f(X
    IN
    )/128 (f(X
    CIN
    )/128 in low-speed mode)
    1 1 1: f(X
    IN
    )/256 (f(X
    CIN
    )/256 in low-speed mode)
    b7
    Serial I/O2 port selection bit
    0: I/O port
    1: S
    OUT2
    ,S
    CLK21
    /S
    CLK22
    signal output
    P6
    /S
    P-channel output disable bit
    0: CMOS output (in output mode)
    1: N-channel open-drain output
    (in output mode)
    Transfer direction selection bit
    0: LSB first
    1: MSB first
    Synchronous clock selection bit
    0: External clock
    1: Internal clock
    Synchronous clock output pin selection bit
    0: S
    CLK21
    1: S
    CLK22
    b0
    b2 b1 b0
    Do not set
    Fig. 27 Block diagram of serial I/O2 function
    f(X
    IN
    )
    “1”
    “0”
    “0”
    “1”
    “0”
    “1”
    S
    C
    (Note)
    1/8
    1/16
    1/32
    1/64
    1/128
    1/256
    Data bus
    Serial I/O2
    interrupt request
    Serial I/O2 port selection bit
    Serial I/O counter 2 (3)
    Serial I/O shift register 2 (8)
    Synchronous circuit
    Synchronous clock
    selection bit
    External clock
    Internal synchronous
    clock select bits
    D
    P6
    3
    latch
    P6
    3
    /S
    CLK22
    P6
    2
    /S
    CLK21
    P6
    1
    /S
    OUT2
    P6
    0
    /S
    IN2
    P6
    2
    latch
    P6
    1
    latch
    (Note)
    Note:
    It is selected by the synchronous clock selection bit, the synchronous
    clock output pin selection bit, and the serial I/O port selection bit.
    (f(X
    CIN
    ) in low-speed mode)
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