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    參數資料
    型號: SAH-C515A-4R
    廠商: INFINEON TECHNOLOGIES AG
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80
    封裝: METRIC, PLASTIC, QFP-80
    文件頁數: 40/182頁
    文件大?。?/td> 1917K
    代理商: SAH-C515A-4R
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    Semiconductor Group
    7-13
    1997-08-01
    Interrupt System
    C515A
    7.3
    How Interrupts are Handled
    The interrupt flags are sampled at S5P2 in each machine cycle. The sampled flags are polled during
    the following machine cycle. If one of the flags was in a set condition at S5P2 of the preceeding
    cycle, the polling cycle will find it and the interrupt system will generate a LCALL to the appropriate
    service routine, provided this hardware-generated LCALL is not blocked by any of the following
    conditions:
    1. An interrupt of equal or higher priority is already in progress.
    2. The current (polling) cycle is not in the final cycle of the instruction in progress.
    3. The instruction in progress is RETI or any write access to registers IEN0 and IEN1 or IP0/IP1.
    Any of these three conditions will block the generation of the LCALL to the interrupt service routine.
    Condition 2 ensures that the instruction in progress is completed before vectoring to any service
    routine. Condition 3 ensures that if the instruction in progress is RETI or any write access to
    registers IEN0/IEN1 or IP0/IP1, then at least one more instruction will be executed before any
    interrupt is vectored to; this delay guarantees that changes of the interrupt status can be observed
    by the CPU.
    The polling cycle is repeated with each machine cycle, and the values polled are the values that
    were present at S5P2 of the previous machine cycle. Note that if any interrupt flag is active but not
    being responded to for one of the conditions already mentioned, or if the flag is no longer active
    when the blocking condition is removed, the denied interrupt will not be serviced. In other words, the
    fact that the interrupt flag was once active but not serviced is not remembered. Every polling cycle
    interrogates only the pending interrupt requests.
    The polling cycle/LCALL sequence is illustrated in figure 7-3.
    Figure 7-3
    Interrupt Response Timing Diagram
    MCT01859
    S5P2
    Interrupt
    is latched
    Interrupts
    are polled
    Vector Address
    Long Call to Interrupt
    Routine
    Interrupt
    C2
    C1
    C3
    C4
    C5
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