Interrupt timing

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  1. - 21st September 2011, 06:47 #1
    Darrel Taylor's Avatar
    Darrel Taylor
    Darrel Taylor is offline Fanatical Contributor
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    Default Re: Interrupt timing

    Quote Originally Posted by Charles Linquis View Post
    Of course, it turns out that I can.
    Awesome!
    DT
  2. - 21st September 2011, 18:11 #2
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    tumbleweed
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    Default Re: Interrupt timing

    An ASM interrupt consumes about 12uSec (determining INT source and context saving and context restoring).
    A PBP interrupt consumes about 25uSec (more variables to save/restore).
    Those numbers are sort of surprising, esp. the ASM one. That seems like a lot of instructions. I haven't used PBP for a long time... is there really that much overhead?
  3. - 21st September 2011, 19:10 #3
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    Default Re: Interrupt timing

    I need to check the ASM listing to figure out all the details, but it is a solid 12uSec. About 7uSec to get "in" and 5 to get "out".

    This is with TMR0 as the interrupt source. Some other sources may take a few more clock cycles to decode.
    Charles Linquist
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