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'[PICLIST] Recommendation of uC, which is better?'
2001\08\08@214711 by pic list

picon face
Hi all,

I need some recommendation on the type of PIC that i
could use. Please read on.
I have wrote some assembly for 68HC11 and studied
on the architecture of Motorolla 68K. I find both of
them complicated, which is why i choose pic16F84 to
use in my final year project. and i never regreted my
decision.

Now i am in the new job and the previous engineer in
my
company uses Motorolla uC(and he is very good at it).
I need to  justify my choice of microcontroller by
showing -
1. i can produce a solution in a similar or shorter
time
2. i don't need expensive programmer and emulator
3. the uC/uP are cheaper than Mot. for a comparable
speed, memory and function ( like A/D convt. )

i don't mind building my own programmer or even
emulator if these info are available freely. Do any
PICListers think this is possible? or maybe possible
up to a certain extent?

Obviously i need a faster uC ( > 20MHz ), larger
memory, and more i/o pins. i would want to use this uC
in most of my solution except when the solution needed
me to have built  in modules like the Ethernet module
( Motorolla Coldfire ).

I hope everyone would give me their evaluation, the
final recommendation may not necessary be pic. Maybe i
should stick to Motorolla, or Scenix ? What constitute
a good engineer? Expert on many types of uc OR Master
of one or two type of uC? Thanks for any advice given.


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2001\08\09@152928 by Lawrence Lile

flavicon
face
> i don't mind building my own programmer or even
> emulator if these info are available freely. Do any
> PICListers think this is possible? or maybe possible
> up to a certain extent?

I have an emulator for PICs somewhere in a closet.  I haven't used it in
years.  I have two programmers - a PICstart Plus (<$200US)  for
out-of-socket programming and a EPIC (from Microengineering Labs <$100US)
for In-System Programming.  The EPIC could do both jobs.  Just buy one, and
skip the emulator, don't build either.  Definitely under $200US and you are
programming PICs.  Assembly language compiler is free from MicroChip.


I find that making the PIC tell me what is going on, via a serial
connection, is just as valuable as an emulator.  While I'm developing I add
in some check points, and print them out a serial LCD, like

if(some dumb error happens)

   printf("You Bozo! You did it again!");
}
and that is the only troubleshooting tool I really need.

If you are doing anything high end you'll also need a C compiler, a
discussion which will ignite a religious war here on the PIClist.
http://www.htsoft.com  and http://www.ccsinfo.com/picc.html  are the two major
players, $100 to $800 US depending on options etc.  Microchip also has one
that only works for some of their parts.
>
> Obviously i need a faster uC ( > 20MHz ), larger
> memory, and more i/o pins. i would want to use this uC
> in most of my solution except when the solution needed
> me to have built  in modules like the Ethernet module
> ( Motorolla Coldfire ).

You may need more horsepower than the fastest PIC.  In that case, we're
knocked out.  I don't think there is any PIC that could handle an ethernet
connection, or has that as a built-in module.  Most top out at 20MHz.

>What constitute
> a good engineer? Expert on many types of uc OR Master
> of one or two type of uC? Thanks for any advice given.

I would go for the breadth.  The more architectures and technologies you are
familiar with, the more versatile you are.  Learn a little about them all,
and on your next job, when they ask you if you know anything about X you can
say "Yup!"


-- Lawrence Lile

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