Re: Why should I (not) use an internal oscillator for 8-bit micros

From: Doug Dotson (dougdotson_at_NOSPAMcablespeed.NOSPAMcom)
Date: 08/16/04

  • Next message: Jay Monkman: "Re: Logic Analyzer Recommendations?" 
    Date: Sun, 15 Aug 2004 20:40:49 -0400

    I believe you, but this is not synchronous communications. You are correct
    that
    synchronous and asynchonous do have meanings depending upon
    the context. However, when talking about data communications the meaings
    are well understood and widely accepted standards. Nuff said!

    Doug

    "Neil Bradley" <nb_no_spam@synthcom.com> wrote in message
    news:10hvv8scv52i489@corp.supernews.com...
    > "Doug Dotson" <dougdotson@NOSPAMcablespeed.NOSPAMcom> wrote in message
    > news:ismdnTKuDKd_T4LcRVn-hQ@cablespeedmd.com...
    > >I believe that UART stands for "Universal ASYNCRONOUS Receiver
    > > Transmitter". You need to go back and study the difference between
    > > sync and async.
    >
    > Nope, I understand the concept perfectly. When using a UART, it's required
    > that both sides of the serial transmission be synchronized. If you don't
    > believe me, try using a crystal at a low baud rate with a 20% tolerance.
    > Devices won't be able to talk to it. When the byte comes is the
    asynchronous
    > part, and that wasn't even the topic being discussed.
    >
    > The question was in reference to the baud rate generating clock, not when
    > the data comes in. For the period of the byte transmission, both sides
    must
    > be synchronized. There is no common clock between them. If you have
    separate
    > clock and data lines, the clock can vary wildly with no adverse effect on
    > communication. No synchronization between devices needed. Is this a hard
    > concept to grasp?
    >
    > You do know that the words synchronous and asynchronous can mean different
    > things depending on the context, right?
    >
    > -->Neil
    >
    >

  • Next message: Jay Monkman: "Re: Logic Analyzer Recommendations?"

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