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    • 參數(shù)資料
    型號(hào)： M38273M7MXXXFS
    廠商： Mitsubishi Electric Corporation
    英文描述： Automotive Catalog Low-Power Rail-to-Rail Input/Output Operational Amplifier with Shutdown 14-TSSOP -40 to 125
    中文描述： 單芯片8位CMOS微機(jī)
    文件頁(yè)數(shù)： 48/70頁(yè)
    文件大小： 1112K
    代理商： M38273M7MXXXFS
    48
    SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    3827 Group
    MITSUBISHI MICROCOMPUTERS
    NOTES ON PROGRAMMING
    Processor Status Register
    The contents of the processor status register (PS) after a reset are
    undefined, except for the interrupt disable flag (I) which is “1”. Af-
    ter a reset, initialize flags which affect program execution.
    In particular, it is essential to initialize the index X mode (T) and
    the decimal mode (D) flags because of their effect on calculations.
    Interrupt
    The contents of the interrupt request bits do not change immedi-
    ately after they have been written. After writing to an interrupt
    request register, execute at least one instruction before performing
    a BBC or BBS instruction.
    Decimal Calculations
    To calculate in decimal notation, set the decimal mode flag (D)
    to “1”, then execute an ADC or SBC instruction. After executing
    an ADC or SBC instruction, execute at least one instruction be-
    fore executing a SEC, CLC, or CLD instruction.
    In decimal mode, the values of the negative (N), overflow (V),
    and zero (Z) flags are invalid.
    Timers
    If a value n (between 0 and 255) is written to a timer latch, the fre-
    quency division ratio is 1/(n + 1).
    Multiplication and Division Instructions
    The index mode (T) and the decimal mode (D) flags do not affect
    the MUL and DIV instruction.
    The execution of these instructions does not change the contents
    of the processor status register.
    Ports
    The contents of the port direction registers cannot be read.
    The following cannot be used:
    The data transfer instruction (LDA, etc.)
    The operation instruction when the index X mode flag (T) is “1”
    The addressing mode which uses the value of a direction regis-
    ter as an index
    The bit-test instruction (BBC or BBS, etc.) to a direction register
    The read-modify-write instruction (ROR, CLB, or SEB, etc.) to a
    direction register
    Use instructions such as LDM and STA, etc., to set the port direc-
    tion registers.
    Serial I/O
    In clock synchronous serial I/O, if the receive side is using an ex-
    ternal clock and it is to output the S
    RDY
    signal, set the transmit
    enable bit, the receive enable bit, and the S
    RDY
    output enable bit
    to “1”.
    Serial I/O1 continues to output the final bit from the T
    X
    D pin after
    transmission is completed.
    In serial I/O2, the S
    OUT2
    pin goes to high impedance state after
    transmission is completed.
    A-D Converter
    The comparator uses internal capacitors whose charge will be lost
    if the clock frequency is too low.
    Make sure that f(X
    IN
    ) is at least 500 kHz during an A-D conver-
    sion.
    Do not execute the STP or WIT instruction during an A-D conver-
    sion.
    Instruction Execution Time
    The instruction execution time is obtained by multiplying the fre-
    quency of the internal clock
    φ
    by the number of cycles needed to
    execute an instruction.
    The number of cycles required to execute an instruction is shown
    in the list of machine instructions.
    The frequency of the internal clock
    φ
    is half of the X
    IN
    frequency.
    相關(guān)PDF資料
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    M38274E2MXXXGP Quad Low Power, Rail-to-Rail Input/Output Operational Amplifier 14-PDIP -40 to 125
    M38274E2MXXXHP Quad Low Power, Rail-to-Rail Input/Output Operational Amplifier 14-PDIP -40 to 125
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