Hi, Im play with a PIC 16F627 and have it wired up with a 4MHz cystal with two 18pF Caps, my question is, do the caps affect the acuracy of the oscillation of the crystal, and I cant find any data on the acuracy of the crystals, I cant check them as I dont have an oscilloscope.
Im running at 4MHz and have created a dealy routine that does exactly
1000000 cycles and does some output have included the output routine cylces to. Im 100% sure the code is correct and that it should produce exactly 1 second time intervals. But when I run the chip for 3 hours I lose 1 second. Im using a watch to check the timing and im sure the watch is very acurate as it cost like $400 and know it keeps good time.What could be the cause of the lost time, do i need better quality crystals or could it be the caps that are affecting it.
Thanks.