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'[EE]: Buad Rate Calculation'
2000\12\14@152415 by Andre Abelian

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Hi to all,

If I have a UART running  at 42 us then how do I
find out the speed. this is what I have.


           |--------|
           |<42us>|
       __|            |____


Andre

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2000\12\14@153039 by Andrew Kunz

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1000000uS / 42uS = about 24K bps

Andy

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2000\12\14@155609 by Olin Lathrop

face picon face
> If I have a UART running  at 42 us then how do I
> find out the speed.

Get the little thingy with all the funny numbered buttons, then enter "1",
"/", ".000042", "=".  The kind with a big button labeled "ENTER" requires a
little different magic, so better just find the other kind with an "="
button for now.

>             |--------|
>             |<42us>|
>         __|            |____

It never ceases to amaze me when people attempt to do ASCII art with
porportionately spaced fonts!  DUH!


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamembedinc.com, http://www.embedinc.com

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2000\12\14@165402 by Lee Jones

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> If I have a UART running  at 42 us then how do I
> find out the speed. this is what I have.
>
>         |--------|
>         | <42us> |
>       __|        |____

The baud rate, as others have pointed out, is the reciprocal
of _one bit time_.  If the 42 microseconds represents a single
bit time, then the baud rate would be 1 / 0.000042 = 23,809.

If the 42 uS represents a character time, then the baud rate
would be 190Kbps (8 bits/frame) or 238Kbps (10 bits/frame).

If measuring the transitions on a signal line, ensure that
you choose characters that have a bit pattern that allows
measuring the width of a single bit.

                                               Lee Jones

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2000\12\14@204315 by Bob Ammerman

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Yeah, but is the time interval displayed a single bit, or perhaps multiple
bit times.

Does the signal have equal rise and fall times?

There is really insufficient information here for an accurate answer.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2000\12\14@204716 by Bob Ammerman

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> If measuring the transitions on a signal line, ensure that
> you choose characters that have a bit pattern that allows
> measuring the width of a single bit.
>
>                                                 Lee Jones

I would prefer to measure two adjacent bits, one a zero and the other a one.
That way I can measure from rise to rise or fall to fall and avoid errors
caused by differing rise and fall times.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2000\12\14@212658 by Barry Gershenfeld

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>> If measuring the transitions on a signal line, ensure that
>> you choose characters that have a bit pattern that allows
>> measuring the width of a single bit.

In ASCII-speak, an uppercase "U" is a good character to use.
Alternating 1's and 0's.

Barry

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2000\12\15@182649 by cflat

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I wish I was half as smart as you think you are.  Sometimes I think
people answer questions whether they know the answer or not just to
keep their advertisement out there.
Charles


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