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'[PIC]: Serial bit banging with 32 kHz Xtal?'
2002\09\06@133950 by Brooke Clarke

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Hello:

Can serial coms work, even at a slow speed, by bit banging when the crystal is
32 kHz?

Thanks,

Brooke Clarke

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2002\09\06@135653 by Code

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Yes, it does work. But how slow do you want it to be?

Tan C C

-----Original Message-----
From: pic microcontroller discussion list
[spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU] On Behalf Of Brooke Clarke
Sent: Saturday, September 07, 2002 1:39 AM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: [PIC]: Serial bit banging with 32 kHz Xtal?

Hello:

Can serial coms work, even at a slow speed, by bit banging when the
crystal is
32 kHz?

Thanks,

Brooke Clarke

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2002\09\06@135852 by Michael F. Coyle

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> Can serial coms work, even at a slow speed, by bit banging when the
crystal is
> 32 kHz?

Yes, but only at a very slow speed, <= 600 baud perhaps.

- Michael

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2002\09\06@140255 by mike

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On Sat, 7 Sep 2002 01:54:39 +0800, you wrote:

>Yes, it does work. But how slow do you want it to be?
..and how much CPU time do you need for other tasks....
I guess 1200 would be possible, _perhaps_ 2400 if you don't need any
CPU bandwidth for anything else.
This would be based on getting an int off the startbit, then staying
in the int code for the whole byte. I've done 115Kbaud rx at 4MHz like
this.
>Tan C C
>
>{Original Message removed}

2002\09\06@182630 by Olin Lathrop

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> Can serial coms work, even at a slow speed, by bit banging when the
crystal is
> 32 kHz?

Sure, as long as the bit rate is slow enough.  You should be able to do 300
baud.


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2002\09\07@060702 by Peter L. Peres

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On Fri, 6 Sep 2002, Brooke Clarke wrote:

>Hello:
>
>Can serial coms work, even at a slow speed, by bit banging when the crystal is
>32 kHz?

Yes, I've done it. Try 600 or 1200 Bauds. There will be a small timing
error that is up to the max allowable timing error you are permitted in
serial comms. I did my own RTC chip, with a twist or two. You cannot
receive at these speeds, but I think that 150 or 300 Bauds can be received
too (haven't tried). I used pushbutton style set and shift adjust buttons,
wired to real buttons or to another mcu.

Peter

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2002\09\09@052143 by Marco Genovesi

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I don't have tested, but in "cheapic"
http://www.piclist.org/techref/piclist/cheapic/index.htm )  tehere is the
code (ALPHABET.ASM , 16F84 based) for 1200 baud with 32Khz crystal.

Marco


{Original Message removed}

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