As one further comment to this, if 256 instructions is about 1mSec, this implies the chip is only being clocked at 1MHz. Honestly if you want to have an interrupt at 1mSec, you need to be clocking the ...
PCM programmer and Ttelmah, THANKS because you have solved many problems I had, and by searching on the forum you already solved the problem. But I need your help now, please!