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How to write interrupt function in assembly in keilc51?

HOWARD XU

I want to write the interrupt routines in assembly ,i don't want to use inline assembly.

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  • 0 in reply to Jon Ward

    A couple more tips:

    Keep your interrupt vectors and servicing routines in a separate source file (e.g. "IRQ.A51") to save yourself some work.

    Also, in Jon's code he did not explicitly show you that the service routines are typically placed in a relocatable segment, not an absolute segment. (And if your interrupt service routine is less than 8 bytes, you do not need the LJMP!)

    So, showing the segment declarations...

    IRQ_procs segment code

cseg at vector_address1
    ljmp irq_name1
.
cseg at vector_address2.
    ljmp irq_name2
.

rseg IRQ_procs

irq_name1:
    isr_code
    .
    .
    reti

irq_name2:
.
.
.

Reply
  • 0 in reply to Jon Ward

    A couple more tips:

    Keep your interrupt vectors and servicing routines in a separate source file (e.g. "IRQ.A51") to save yourself some work.

    Also, in Jon's code he did not explicitly show you that the service routines are typically placed in a relocatable segment, not an absolute segment. (And if your interrupt service routine is less than 8 bytes, you do not need the LJMP!)

    So, showing the segment declarations...

    IRQ_procs segment code

cseg at vector_address1
    ljmp irq_name1
.
cseg at vector_address2.
    ljmp irq_name2
.

rseg IRQ_procs

irq_name1:
    isr_code
    .
    .
    reti

irq_name2:
.
.
.

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