Hi, I am still an amateur PIC programmer and am having problem writing a program. What I am trying to do is write a frequency generator to generate pulses between 20 and 400Hz. I am using a 16C57 for the program. I am using the RTCC to get the frequency. I tried using a lookup table to change frequencies, but it was to big to fit into the 1st 256bytes of the page(the simulator gave all sorts of wierd problems) and I had to use 2 tables...one for the RTCC and another to change the Prescaler.....This was not very effiecient......Can anyone give me any ideas on other ways of doing this? Christopher Tyler -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics