I haven't build it yet, but i plan the time it takes to charge the cap, and somehow store this value in two 8 bit registers to maintain 16bit precision, but i still don't know how to do this. ----Original Message Follows---- From: Jinx In your measurement system, does the two-byte version of the number then already exist somewhere in the PIC ? Or have you not written/built the system yet ? Jinx > It's just the worst case extremes of a KTY thermistor. 3000 ohm is the max i > expect to measure 500 is the minimum. Though still just expectations. But i > think that if i use two 8bit registers i will have enough storage space for > whatever is measured. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com