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'[PICLIST] [PIC] - 16f628 and PICUSART.ASM'
2002\05\30@110605 by Rex Byrns

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Can anyone help me out with getting the 16f628 to work with the picusart
code?

What is a MAX232? Do I have to have one to talk to a PC?

I will probably use VB to build the PC interface.

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2002\05\30@194734 by Tony Nixon

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Rex Byrns wrote:
>
> Can anyone help me out with getting the 16f628 to work with the picusart
> code?
>
> What is a MAX232? Do I have to have one to talk to a PC?
>
> I will probably use VB to build the PC interface.
>
> --
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This little zip file has some basic UART code for a 16F627 and a 16F873.
Plus a bit banged UART.

http://www.bubblesoftonline.com/projects.rs232.zip

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Tony

mICros
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2002\05\30@202413 by Byron A Jeff

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On Fri, May 31, 2002 at 09:44:08AM +1000, Tony Nixon wrote:
> Rex Byrns wrote:
> >
> > Can anyone help me out with getting the 16f628 to work with the picusart
> > code?
> >
> > What is a MAX232? Do I have to have one to talk to a PC?
> >
> > I will probably use VB to build the PC interface.
> >
> > --
> > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > email EraseMElistservspam_OUTspamTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body
>
> This little zip file has some basic UART code for a 16F627 and a 16F873.
> Plus a bit banged UART.
>
> http://www.bubblesoftonline.com/projects.rs232.zip

Oops! Tony. The actual address of the file is:
http://www.bubblesoftonline.com/projects/RS232.zip

BAJ

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2002\05\30@202849 by David P. Harris

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Tony-
Link does not appear to work.
David

Tony Nixon wrote:

{Quote hidden}

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2002\05\30@212127 by Tony Nixon

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"David P. Harris" wrote:
>
> Tony-
> Link does not appear to work.
> David

Sorry :-}

As Byron pointed out, should have been...

http://www.bubblesoftonline.com/projects/rs232.zip


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2002\05\31@124353 by Harold M Hallikainen

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       And regarding the second question (MAX232), yes, you generally need to
convert from TTL levels to EIA232 levels. The USART outputs a 1 (+5V) for
the mark condition, and outputs 0V for the space condition. EIA232 is
generally -12V for mark (there's actually a wide range of acceptable
voltages, but -12V is typical), and +12V for space. So, you need to
invert the signal and change voltage levels. Most EIA232 receivers will
accept 0V as a mark, so it's possible (though not within the standard) to
directly drive an EIA232 receiver with TTL levels. However, the logic
levels still need to be inverted, since a low (-12V) is a mark. If you
are bit banging the data, you can do this inversion in software. If
you're using the USART, you need to do this change in hardware.
       The old standard chips are the MC1488 quad EIA232 driver and the MC1489
EIA232 receiver. Maxim has a variety of EIA232 transmitters, receivers,
and transceivers. An interesting one I used recently is the MAX221. Its
charge pumps shut down if there is not a valid EIA232 voltage on its
receiver input, vastly decreasing power consumption when nothing is
plugged into the EIA232 port. It also has a pin that goes high when a
valid EIA signal is present. I tell the PIC16f870 to sleep when there's
no terminal connected.

Harold


On Fri, 31 May 2002 09:44:08 +1000 Tony Nixon
<Tony.NixonEraseMEspam.....ENG.MONASH.EDU.AU> writes:
{Quote hidden}

FCC Rules Online at http://hallikainen.com/FccRules
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