From: Jim Brain (brain_at_jbrain.com)
Date: 2004-11-03 15:34:17
Marko Mäkelä wrote:
>You didn't mention one trick that Andreas Boose once told me: the double
>interrupt trick. Set up two interrupts. The first one would be served with
>some jitter, and the second one would be triggered while the first one is
>executing NOP instructions. On the 6502, you'd have to get rid of the 0..1
>cycle jitter in the second interrupt because the shortest instructions take
>2 cycles, but on the AVR the first interrupt can be executing 1-cycle
>instructions, and the second interrupt will be cycle-exact.
>
>
This is a neat idea (I'll stuff it in my bag of tricks), but I'm not
sure how to discern the 3 cycle jitter, as my first IRQ is the detection
of the falling edge of the POT line.
Jim
--
Jim Brain, Brain Innovations
brain@jbrain.com http://www.jbrain.com
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!
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