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Designing a stopwatch with pic 16f887
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matlark
Sun Jun 01 2008, 05:02AM
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I need to design a stopwatch that counts to 99.99 using 8 led's in a row (number will be displayed in BCD). I was thinking that I would utilize the OSCCON reg to slow down the clock speed but I am having trouble coming up with how I need to divide the frequency.
Any ideas are welcome. thanks
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Ajay
Sun Jun 01 2008, 08:11PM
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use Timers with prescaler for dividing the clock.

Its easy to make a stop watch with approximate accuracy in PIC.
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matlark
Sun Jun 01 2008, 10:50PM
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Would it be best to use Timer1 over Timer0 or does it not matter which timer I use? Any other advice?
thanks
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Ajay
Sun Jun 01 2008, 10:59PM
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I really doesn't matter you which timer you are using. but the important thing is... is that timer capable of generating the time delay you need..
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matlark
Sun Jun 01 2008, 11:12PM
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I am having trouble coming up with how I need to break the timer up. If I use maximum prescale so that I have approx 3906.25 instructions per second. How do I implement that to the stopwatch? I am thinking I need to utilize a postscale of some value and mayble slow down the internal clock using OSCCON.
thanks
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Ajay
Sun Jun 01 2008, 11:48PM
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I think you are getting me wrong
prescaler will only divide the clock input of timer not the CPU, cpu will execute the instructions normally where as the increment of timer value will be according to the clock frequency you set using prescaler.

Take a close look at the timer chapter of PIC 16F887 datasheet.
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