DT Elapsed Timer Question

[rocket_troy]

So, if I was to make an interrupt routine that only incremented a... say 16 bit variable - say 3 or 4 lines of assembler and that's all it did - would I be risking too much to not back up the system variables?

[richard]

if your isr's only use asm code then there is no need to back up any pbp working registers at all , mcu context must always be saved and restored in the isr process. most advanced core pic's have auto context save/restore otherwise that need to be added to the isr process too, refer to your datasheet

[rocket_troy]

Thanks again Richard. I might have crack at a bleeding minimum overhead routine over the weekend and see what happens.