If you have a logic probe like this one:
http://www.saleae.com/logic
then it simplifies testing radically.
You get to measure hertzes down to 4 decimal places, as well as view several communication protocols like I2C, SPI, 1-wire, CAN, etc. I used it to get LEDs blinking at 120Hz and I have to say it works great (wish I could afford to upgrade to Logic 16).
About the preloading, that's what I did using Darrel's template. Details here:
http://www.darreltaylor.com/DT_INTS-...rTemplate.html
The only limitation I found with the template is the 16 MHz cap, other than that it was easy to set up. It's too bad 'cause I was running the 18F44K22 at 64MHz until now. I wished I knew enough about interrupts to go without the template, but hey, it's the price I have to pay to be me.
Robert




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