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How could I make a adjustable delay function in "micro-second" level

Jason Yang

Hello Every :

I use AT89C52 and 11.059MHz oscillator.
1 instuction takes about 1 micro-second.(10^-6 sec.)

I write a delay function in *.asm.

It works well , but I want it adjustable.
I want to delay according to the parameter I pass.My goal is to modify delay time for some protocol time slot testing.

I found it some how difficult to achieve.
Because the basic instruction , for example : _nop_ , take 1 micro-second.
I can't add more decision. It will takes more time.

How could I implement such kind of delay?
Please give me a hand , thanks a lot~~

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  • 0 in reply to Drew Davis

    I want to delay according to the parameter I pass.My goal is to modify delay time for some protocol time slot testing.


    For delays this short the only option is inline nop.

    two possibilities

    1) Since you refer to "testing" could you use a conditional assembly.

    2) Selecting the routine instead of selecting the delay:

    do_it_with_1
    mov...
    ...
    ....
    ...
    nop
    ...
    ...
    ...
    ...
    ret

    do_it_with_2
    mov...
    ...
    ....
    ...
    nop
    nop
    ...
    ...
    ...
    ...
    ret

    Erik

Reply
  • 0 in reply to Drew Davis

    I want to delay according to the parameter I pass.My goal is to modify delay time for some protocol time slot testing.


    For delays this short the only option is inline nop.

    two possibilities

    1) Since you refer to "testing" could you use a conditional assembly.

    2) Selecting the routine instead of selecting the delay:

    do_it_with_1
    mov...
    ...
    ....
    ...
    nop
    ...
    ...
    ...
    ...
    ret

    do_it_with_2
    mov...
    ...
    ....
    ...
    nop
    nop
    ...
    ...
    ...
    ...
    ret

    Erik

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