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 firstname.lastname@example.org http://www.jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Message was sent through the cbm-hackers mailing list
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