參數(shù)資料
      型號: M38224MAXXXFS
      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
      文件頁數(shù): 17/78頁
      文件大?。?/td> 998K
      代理商: M38224MAXXXFS
      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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