piclist 2002\12\02\222629a >
Thread: What do I need?
picon face BY : Bob Ammerman email (remove spam text)

> Bob Ammerman wrote:
> > Believe it or not I am thinking of developing a project
> > on an SX48. I have a need for multiple UARTs at high
> > baud rates, and you just can't do that on a PIC. The
> > only dual UART PICs are high pin count monsters,
> > and that isn't very appealing either. PICs, of course,
> > don't have the speed to do it by bit-banging, but the
> > SX certainly does...
>    May be I'm missing something, but I can't understand
> are SX48 REALY much faster then 18FXXXX ?
>    18FXXXX have more efficient code, so they are not
> 4 times slower.
>    Mike.

SX48 = 50 to 75 MIPS
18FXXX = 10MIPS (or less depending on the value of XXX)

This is a 5x to 7.5x (or higher) difference.

For the low-level stuff I need to do, the 18F's coding advantages are just
not very significant.
Call it perhaps 1.2 vs. the SX


Net is 5x/1.2 = 4.167 to 7.5x/1.2 = 6.25

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Mike Singer" <.....msingerEraseMEspamspam_OUTPOLUOSTROV.NET>
To: <spamBeGonePICLIST@spam@spamTakeThisOuTMITVMA.MIT.EDU>
Sent: Monday, December 02, 2002 4:44 PM
Subject: Re: [SX]: What do I need?

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<003301c29a7b$8bec76a0$6600a8c0@DELL8100> 7bit

See also: www.piclist.com/techref/ubicom/devices.htm?key=sx
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