參數(shù)資料
    型號: MC68HCL05P1ADWR2
    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, PDSO28
    封裝: SOIC-28
    文件頁數(shù): 61/124頁
    文件大?。?/td> 623K
    代理商: MC68HCL05P1ADWR2
    Interrupts
    Hardware Interrupts
    MC68HC05P1A Rev. 3.0
    General Release Specification
    MOTOROLA
    Interrupts
    41
    NON-DISCLOSURE
    AGREEMENT
    REQUIRED
    Figure 4-2. IRQ Function Block Diagram
    NOTE:
    When the edge- and level-sensitive mask option is selected, the voltage
    applied to the IRQ pin must return to the high state before the RTI
    instruction in the interrupt service routine is executed to avoid the
    processor re-entering the IRQ service routine.
    The IRQ pin is one source of an IRQ interrupt, and a mask option can
    also enable the port A pins (PA0–PA7) to act as other IRQ interrupt
    sources. These sources are all combined into a single ORing function to
    be latched by the IRQ latch.
    Any enabled IRQ interrupt source sets the IRQ latch on the falling edge
    of the IRQ pin or a port A pin if port A interrupts have been enabled. If
    edge-only sensitivity is chosen by a mask option, only the IRQ latch
    output can activate a request to the CPU to generate the IRQ interrupt
    sequence. This makes the IRQ interrupt sensitive to the following cases:
    1. Falling edge on the IRQ pin with all enabled port A interrupt pins
    at a high level.
    2. Falling edge on any enabled port A interrupt pin with all other
    enabled port A interrupt pins and the IRQ pin at a high level.
    IRQ
    LATCH
    R
    VDD
    IRQ PIN
    MASK OPTION
    (IRQ LEVEL)
    TO IRQ
    PROCESSING
    IN CPU
    TO BIH & BIL
    INSTRUCTION
    SENSING
    RST
    IRQ VECTOR FETCH
    PA7
    DDRA7
    PA0
    DDRA0
    PA0 IRQ INHIBIT
    (MASK OPTION)
    PA7 IRQ INHIBIT
    (MASK OPTION)
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