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David Duffy wrote:

> Wan Hasmi wrote:
> >I am in a middle of programming a 3x4 keypad using PIC16F84. does anyone
> >know which is better, either to use interrupt (wake-up on key stroke) or
> >to poll the 3x4 keypad in main loop? I've seen one sample code but not
> >quite understand why they use the TMR0 overflow as a timing to scan the keypad.
>
> It depends on what else your program has to do. Most times you
> only need to scan the keypad every 50-100ms, not continuously.
> This allows you to do other tasks between scans if you like.
> BTW, I've changed the subject line to include the tag.
> Regards...
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

...if timing is an issue then you may use Slave port characteristic to "autolatch"
any keystroke and then take your time to poll the port.

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