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  • 參數(shù)資料
    型號: MC68HCL05J1AP
    廠商: MOTOROLA INC
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20
    封裝: PLASTIC, DIP-20
    文件頁數(shù): 67/128頁
    文件大?。?/td> 1279K
    代理商: MC68HCL05J1AP
    Interrupts
    Interrupt Sources
    MC68HC05J1A — Rev. 3.0
    Technical Data
    MOTOROLA
    Interrupts
    43
    Figure 4-1. External Interrupt Logic
    External interrupt triggering sensitivity is a mask option. The IRQ pin can
    be negative edge-triggered only or negative edge- and low
    level-triggered.
    With the mask option for an edge- and level-sensitive external interrupt
    trigger, a falling edge or a low level on the IRQ pin latches an external
    interrupt request. Edge- and level-sensitive triggering allows the use of
    multiple wired-OR external interrupt sources. An external interrupt
    request is latched as long as any source is holding the IRQ pin low.
    With the mask option for an edge-sensitive only external interrupt trigger,
    a falling edge on the IRQ pin latches an external interrupt request. A
    subsequent external interrupt request can be latched only after the
    voltage level on the IRQ pin returns to logic 1 and then falls again to
    logic 0.
    LEVEL-SENSITIVE TRIGGER
    PA3
    PA2
    PA1
    IRQ
    PA0
    IRQ
    LATCH
    VDD
    (MASK OPTION)
    RST
    IRQ VECTOR FETCH
    IRQ STATUS AND CONTROL REGISTER
    EXTERNAL
    INTERRUPT
    REQUEST
    IR
    Q
    E
    IR
    Q
    F
    IRQ
    R
    PORT A
    EXTERNAL INTERRUPTS
    ENABLED
    (MASK OPTION)
    INTERNAL DATA BUS
    TO BIH & BIL
    INSTRUCTION
    PROCESSING
    R
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