Thanks guys (Olin and Spehro) I was afraid you might say that. I haven't got any spare pins but I get the picture. I have to think again... thanks for your replies.. z ----- Original Message ----- From: "Olin Lathrop" To: Sent: 28 November 2002 23:45 Subject: Re: [PIC]: PIC12C508 > >> > PIC12C508, Internal OSC, Internal reset, no watchdog. I now understand the > setting of OSCCAL in code thank to your help. > I have a timer period of 60 seconds delay. On the simulator the delay is > spot on. But when I run the code on a real device it is about 2 second > slow. Any suggested ideas...? > > Yeah, live with it. That's about 3% off, which is within the specs of the > internal oscillator at the right OSCCAL value, if I remember right (I don't > have the data sheet in front of my right now). > > If you need better accuracy, you will need some sort of external reference > or external oscillator. -- 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