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    參數(shù)資料
    型號： M38001E8-XXXHP
    廠商： Mitsubishi Electric Corporation
    英文描述： POT 500 OHM 1/2 SQ CERM SL MT
    中文描述： 8位單片機
    文件頁數(shù)： 127/173頁
    文件大?。?/td> 4203K
    代理商： M38001E8-XXXHP
    3800 GROUP USER’S MANUAL
    3-25
    APPENDIX
    3.4 Countermeasures against noise
    Fig. 3.4.2 Wiring for clock I/O pins
    (3) Wiring for the V
    PP
    pin of the One Time PROM
    version and the EPROM version
    (In this microcomputer the V
    PP
    pin is also used
    as the CNV
    SS
    pin)
    Connect an approximately 5 k
    resistor to theV
    PP
    pin the shortest possible in series and also to the V
    SS
    pin. When not connecting the resistor, make the
    length of wiring between the V
    PP
    pin and the V
    SS
    pin
    the shortest possible.
    Note:Even when a circuit which inclued an
    approximately 5 k
    resistor is used in the Mask ROM
    version, the maicrocomputer operates correctly.
    Reason
    The V
    PP
    pin of the One Time PROM and the EPROM
    version is the power source input pin for the built-in
    PROM. When programming in the built-in PROM,
    the impedance of the V
    PP
    pin is low to allow the
    electric current for wiring flow into the PROM. Be-
    cause of this, noise can enter easily. If noise enters
    the V
    PP
    pin, abnormal in struction codes or data are
    read from the built-in PROM, which may cause a
    program runaway.
    3.4.2 Connection of a bypass capacitor across the
    Vss line and the Vcc line
    Connect an approximately 0.1
    μ
    F bypass capacitor
    across the V
    SS
    line and the V
    CC
    line as follows:
    G
    Connect a bypass capacitor across the V
    SS
    pin
    and the V
    CC
    pin at equal length .
    G
    Connect a bypass capacitor across the V
    SS
    pin
    and the V
    CC
    pin with the shortest possible wiring.
    G
    Use lines with a larger diameter than other signal
    lines for V
    SS
    line and V
    CC
    line.
    Fig. 3.4.3 Wiring for the V
    PP
    pin of the One Time PROM
    and the EPROM version
    Fig. 3.4.4 Bypass capacitor across the V
    SS
    line and
    the V
    CC
    line
    AA
    AA
    AA
    AA
    AA
    V
    CC
    AAAA
    AAAA
    AAAA
    V
    V
    CC
    Chip
    AAA
    AAA
    A
    X
    IN
    X
    OUT
    V
    SS
    An example of V
    SS
    patterns on the
    underside of a printed circuit board
    Oscillator wiring
    pattern example
    Separate the V
    SS
    line for oscillation from other V
    SS
    lines
    Noise
    X
    IN
    X
    OUT
    V
    SS
    X
    IN
    X
    OUT
    V
    SS
    N.G.
    O.K.
    CNV
    SS
    /V
    PP
    Approximately
    5k
    3800 group
    V
    SS
    Make it the shortest possible
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    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
    M38001E8-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER
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    M38001M1-DXXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
    M38001M1-DXXXSP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
    M38001M1-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER
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