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'8051 and PIC families'
1999\09\14@041045 by Duilio Foschi

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which are the pros and cons of selecting a PIC over a member of the 8051
family ?

Is this a question of religion or are there practical differences ? :)

Thank you

Duilio Foschi

1999\09\14@051820 by Brent Brown

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Hi,

I use PIC's and 8051's.  In both cases I program in C, so the
instruction set doesn't matter too much to me.

I tend to go for PIC's for my smaller projects because the I/O
structure is much more felexible.  8051 I/O usually outputs logic
high during reset which can be a pain, as well as having weak pull
ups all the time, and this can mean more external hardware
considerations.  On chip WDT and reset also assists these small
projects, making them much more a one chip design, but the new
8051 compatible Philips 87LPC764 is worth a mention.

My 8051 designs mostly use Atmel Flash devices now, which are
exceptionally great for development.

which are the pros and cons of selecting a PIC over a member of the 8051
> family ?
>
> Is this a question of religion or are there practical differences ? :)
>
> Thank you
>
> Duilio Foschi
>

Brent Brown
Electronic Design Solutions &
HI-TECH Software Sales
16 English Street
Hamilton, New Zealand
Toll Free: 0508 HITECH (0508 448 324)
Ph/fax: +64 7 849 0069
Mobile: 025 334 069
eMail:  spam_OUTbrent.brownTakeThisOuTspamclear.net.nz

1999\09\14@114840 by - KITS EDUCACIONAIS NACIONAIS

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Duilio Foschi wrote:
>
> which are the pros and cons of selecting a PIC over a member of the 8051
> family ?
>
> Is this a question of religion or are there practical differences ? :)
>
> Thank you
>
> Duilio Foschi

8051 has many manufactures! (MHS,PHILIPS,ATMEL,INTEL,SIEMENS,AMD,TEMIC,TDK etc..
.)

Miguel

1999\09\14@144106 by Peter Tiang

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And some OTP version available for less than US$1, e.g.
WinBond's 80C52.

Good if you don't have intention to release a masked ROM
version and for low volume production.

Regards,
Peter Tiang


{Original Message removed}

1999\09\14@195044 by Dennis Plunkett

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At 21:16 14/09/99 +1200, you wrote:
>Hi,
>
>I use PIC's and 8051's.  In both cases I program in C, so the
>instruction set doesn't matter too much to me.
>
>I tend to go for PIC's for my smaller projects because the I/O
>structure is much more felexible.  8051 I/O usually outputs logic
>high during reset which can be a pain, as well as having weak pull
>ups all the time, and this can mean more external hardware
>considerations.

This is not quite so, the 8051 has "Quasi bi-directional" ports. This means
that it has 100K sort of thing always pulling the pin up, it is able to
sink 20mA, so you are nominaly forced to design active low (Not a bad idea
at any time)

The 8051 is great for largish projects that require the I/O it can provide.
The 8051 is harder on current, but the monimally better peripherals make
this worth while. There is more than one source for the 8051 and lots of
stuff out there for them.

As for the structure being more flexable for the PIC...?

Normally it comes down to the size of the project and the intended cost


Dennis


 On chip WDT and reset also assists these small
{Quote hidden}

1999\09\15@142453 by nerstrand

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PICmicro is simply the best if you listen to my opinion.
Just to name a few things:
Look at driving capability on I/O pins.
Look at sleepmode current.
Look at migration to other controllers in the same family (Microchip have a bundle of  PICmicro to easily migrate between).
Look at development tools costs.
Look at code efficiency (Microchip RISC).


Regards
Niklas W


{Original Message removed}

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