• 參數(shù)資料
    型號: M38003M4-XXXSS
    廠商: Mitsubishi Electric Corporation
    元件分類: DC/DC變換器
    英文描述: 1 watt dc-dc converters
    中文描述: 1瓦的DC - DC轉(zhuǎn)換器
    文件頁數(shù): 101/173頁
    文件大小: 4203K
    代理商: M38003M4-XXXSS
    APPLICATION
    2.4 Processor mode
    2-53
    3800 GROUP USER’S MANUAL
    (2) Application example of memory expansion in the case where the
    ONW
    (One-Wait)
    function is used
    Outline
    :
    ONW
    function is used when the external memory access is slow.
    If “L” level signal is input to the P3
    2
    /
    ONW
    pin while the CPU is in the read or write status,
    the read or write cycle corresponding to 1 cycle of
    φ
    is extended. In the extended period,
    the
    RD
    or
    WR
    signal is kept at the “L” level. The
    ONW
    function operates only when data is
    read from or written into addresses 0000
    16
    to 0007
    16
    and addresses 0440
    16
    to FFFF
    16
    .
    Figure 2.4.7 shows an application example of the
    ONW
    function.
    Fig. 2.4.7 Application example of the
    ONW
    function
    3800 group
    CNV
    SS
    AD
    15
    8
    P5
    8
    P6
    ONW
    AD
    14
    AD
    0
    DB
    0
    DB
    7
    RD
    WR
    M5M27C256AK-10
    M5M5256BP-10
    CE
    A
    0
    –A
    14
    D
    0
    –D
    7
    OE
    A
    0
    –A
    14
    DQ
    1
    –DQ
    8
    OE
    W
    8MHz
    V
    CC
    = 5.0V ± 10 %
    External RAM area
    (M5M5256BP)
    SFR area
    Internal RAM area
    External RAM area
    (M5M5256BP)
    External ROM area
    (M5M27C256AK)
    0000
    16
    8000
    16
    0440
    16
    0040
    16
    0008
    16
    FFFF
    16
    Memory map
    74F04
    S
    15
    8
    8
    P4
    2
    P3
    0
    , P3
    1
    EPROM
    SRAM
    2
    P7
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    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
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