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sx20 lcd serial adapter crystal — Parallax Forums

sx20 lcd serial adapter crystal

OwenOwen Posts: 100
edited 2007-04-08 00:44 in General Discussion
I'm building an LCD serial adapter similar to the parallax sx/b serial LCD example but with the sx20 chip. My question is do I need an external crystal or resonator for this? or can I get away with using the internal resonator at 4mhz? the example i have seen use external 4mhz resonators, is the internal 4mhz resonator not acurate enugh for serial comunication?

Owen

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2007-04-08 00:41
    Owen said...
    is the internal 4mhz resonator not acurate enugh for serial comunication?
    That's been a matter of "debate."· It may be that it depends on the bps (favoring slower speeds.)· I'm picky and have always gone with a crystal-based clock or an external oscillator.
  • JonnyMacJonnyMac Posts: 9,214
    edited 2007-04-08 00:44
    There really is no debate: for relaiable serial comms you should use an external crystal or oscillator.
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