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    參數(shù)資料
    型號(hào): M38224M6HFS
    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): 17/78頁
    文件大?。?/td> 998K
    代理商: M38224M6HFS
    24
    SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
    3822 Group
    MITSUBISHI MICROCOMPUTERS
    Key Input Interrupt (Key-on wake-up)
    A Key-on wake-up interrupt request is generated by applying a
    falling edge to any pin of port P2 that have been set to input mode.
    In other words, it is generated when AND of input level goes from
    “1” to “0”. An example of using a key input interrupt is shown in
    Figure 20, where an interrupt request is generated by pressing
    one of the keys consisted as an active-low key matrix which inputs
    to ports P20–P23.
    Fig. 20 Connection example when using key input interrupt and port P2 block diagram
    Port PXX
    “L” level output
    Port P27
    direction register = “1”
    P27 output
    P26 output
    PULL register A bit 2 = “1”
    P25 output
    P24 output
    P23 input
    Port P26
    latch
    Port P25
    latch
    Port P24
    latch
    Port P23
    latch
    Port P27
    latch
    Port P25
    direction register = “1”
    Port P24
    direction register = “1”
    Port P23
    direction register = “0”
    P22 input
    P21 input
    P20 input
    Port P22
    latch
    Port P21
    latch
    Port P20
    latch
    Port P22
    direction register = “0”
    Port P21
    direction register = “0”
    Port P20
    direction register = “0”
    Port P2
    Input reading circuit
    P-channel transistor for pull-up
    CMOS output buffer
    Key input interrupt request
    Port P26
    direction register = “1”
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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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