Your right! I didn't think of that.  The fact that the chip may be =
cheaper, and also that fact that you may want to do something outside =
the USART protocol, like for instance auto-baud recognition.  Good =
point.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of D. Jay Newman
> Sent: Sunday, June 06, 2004 2:16
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC:] Beginner looking for suggestions
>=20
> > If this is correct, I rack my brain trying to think of any
> advantages bit-banging on a PIC would have over an on-chip
> USART.  What am I missing?
>=20
> Generally you're right. However, there are a few cases where
> bit-banging
> can be necessary:
>=20
> 1. You need one more than provided. Perhaps you're using a
> 10Fxxx PIC
>    which have no USART.
> 2. Perhaps you want something other than standard serial, such
> as SPI
>    or I2C on a chip that doesn't support it or again, you want
> one more
>         than are provided.
> 3. You want a protocol which isn't provided on the chip.
>=20
> Basically all of these go to one general rule:
>=20
>   You want one more of something than the chip provides.
>=20
> Other than that I don't see any reason to bit-bang.
>=20
> However, this is for my personal use. If I wanted to sell
> something in
> large quantites, it might be more economical for me to spend the
> programming
> time to bit-bang something on a less expensive chip.
> --
> D. Jay Newman           !
> jay@sprucegrove.com     ! Xander: Giles, don't make cave-slayer
> unhappy.
> http://enerd.ws/robots/ !
>=20
> --
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> topic:
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>=20
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>=20

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=20

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