Calculating a known and deadly accurate interrupt frequency rate (pic multicalc etc)

[Darrel Taylor]

PicMultiCalc doesn't do TMR2,4,6 unless PR2=255 and you reload on every interrupt.

TMR2 counts up to the PR2 value + 1, then resets and interrupts.
So you were only getting 64 counts. (62.5Khz)

For 200 counts, set PR2 to 199.

[HankMcSpank]

Thanks guys.... PR2 of 199 does indeed get me a toggle frequency of 10khz (actually it's showing bouncing between 9.99khz & 10.0khz ....but that's likely to be a rounding/beating error to do with my scope).

Darrel thanks for solving the multicalc puzzle to ...thought I was going insane (I probably am anyway "Nurse, more medication quick").

[cncmachineguy]

You know I knew that, and as soon as I opened this this morning I thought "PR needs to be reload value -1", I bet thats what DT has posted. It still doesn't explain 9.93K, cuz the math if using 201 for the value (pr=200) works out to 9.95K. Thats where I was stumped.