AVR-Chat

----- Original Message ----- 

From: NGUYEN NGA VIET
To: AVR-Chat@yahoogroups.com
Sent: Monday, December 06, 2004 10:27 AM
Subject: [AVR-Chat] advantages and dissadvantages of AVRs.


Anyone can tell me about the advantages and dissadvantages of AVRs ?
Or, why did you choose an AVR for your jobs ? In what kinds of projects, 
AVRs are the best choice ?
Thank you.

For me, it's primarily the architecture, and because the packages are easy 
to use with home-made PCBs. For some applications the MSP430 is much 
better - nice architecture, very low power, 16 bit, and cheap. Then there 
are the Philips LPC2000 ARM chips - cheap, fast and 32 bit.

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller
http://www.kasamba.com/viewExpert.asp?conMemID=105725&Catid=1111&banID=2100

VNN,

> Or, why did you choose an AVR for your jobs ? In what kinds of projects,
AVRs are the best choice ?

For me, I choose them for several reasons
1) They are Fast, most instructions are 1 clock per instruction, not 4
clocks like certain other micros.
2) Good support for C
3) Great on board features, like hardware USARTs, PWM, ADCs, etc

I looked at PICs, when I began playing, they're slower, have less features
and almost no support for C coding.

Paul (still after a 32Mhz AVR!)

Leon,

> Then there  are the Philips LPC2000 ARM chips - cheap, fast and 32 bit.

carefull...
I bought one of those kits hoping to use it, but sadly the IO is limited to
a max frequency of around 3Mhz, even if the internal core is running at
60Mhz, its to do with the way Philips interfaced the ARM core.

Hence, I've got an MB40 TinyArm board with LCD for sale if anyone wants it
(preferably UK).

Paul

----- Original Message ----- 

From: Paul Maddox
To: AVR-Chat@yahoogroups.com
Sent: Monday, December 06, 2004 11:04 AM
Subject: Re: [AVR-Chat] advantages and dissadvantages of AVRs.


Leon,

> Then there  are the Philips LPC2000 ARM chips - cheap, fast and 32 bit.

carefull...
I bought one of those kits hoping to use it, but sadly the IO is limited to
a max frequency of around 3Mhz, even if the internal core is running at
60Mhz, its to do with the way Philips interfaced the ARM core.

Yes, that is annoying. I was puzzled by it when I tried to drive a DAC as 
fast as possible. Philips have an explanation on the LPC2000 Yahoo group; 
IIRC it's nothing to do with them but inherent in the ARM design.

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller
http://www.kasamba.com/viewExpert.asp?conMemID=105725&Catid=1111&banID=2100

Leon,

> Yes, that is annoying. I was puzzled by it when I tried to drive a DAC as
> fast as possible. Philips have an explanation on the LPC2000 Yahoo group;
> IIRC it's nothing to do with them but inherent in the ARM design.

Its a big shame, it means I can't use the LPC for what I had hoped.. I can't
beleive it, 60MHZ core at almost 60MIPs and 3Mhz output? I mean thats
ridiculous, even my little MEGA8 can do 8Mhz on its outputs!

Paul

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--- In AVR-Chat@yahoogroups.com, NGUYEN NGA VIET <vnn_hi@y...> wrote:
> Anyone can tell me about the advantages and dissadvantages of AVRs ?
> Or, why did you choose an AVR for your jobs ? In what kinds of 
projects, AVRs are the best choice ?
> Thank you.
> 

I think it's been fairly well covered, but I have chosen AVR's 
because of their speed and ease of programming.  PIC's require much 
more elaborate initialization routines for USART, A/D converter, etc. 
than the AVR's.  The A/D converter in the AVR's seems more immune to 
noise. Having 32 general-purpose registers to work with is also a 
plus.

I'm playing with using a port of an AVR as a hardware DAC (R/2R 
ladder).  The speed available makes for a much higher possible output 
frequency than other devices I've used.  (Note, I'm trying to keep it 
very simple).

Zack

It would be interesting to post a message like this in
a PIC or Motorola related forum. Programmers that use
PICs like the reduced instruction set (some pics have
only 33 instructions), but this is important only if
you write assembly code.  I compared Atmega16 and
PIC18F452 and the latter one has 34 I/O (only 33 if
you use an external crystal), 1536 bytes RAM, 32K
FLASH and 256 bytes EEPROM.  Prices are similar but I
have chosen Atmega16 because of the speed.  Also, a
time ago I worked with PIC16C65A and it had a lot of
bugs so the code needed to be tricky.


Jose

> --- In AVR-Chat@yahoogroups.com, NGUYEN NGA VIET
> <vnn_hi@y...> wrote:
> > Anyone can tell me about the advantages and
> dissadvantages of AVRs ?
> > Or, why did you choose an AVR for your jobs ? In
> what kinds of 
> projects, AVRs are the best choice ?
> > Thank you.



	

	
		
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I agree. I choose AVR mostly because of the speed. Among 
the common micros (8051,AVR,PIC,motorola), there are some 
applications where only AVRs can do the job directly (e.g. 
video signal generation). It is the fastest micro i can 
find here (my country).

Secondly, i choose AVR's because of the price. I believe 
it is still cheaper than motorola or PIC (almost the 
same).

But for developing simple projects in team at my 
workplace, i would prefer 8051s (AT89S52) because of its 
availability in a nearby electronics shop, and there are 
already many developers of 8051 in my campus (much more 
compared to AVRs), and it is only half the price of the 
cheapest AVRs.

Regards,
Irfan.

On Tue, 7 Dec 2004 20:37:54 -0300 (ART)
  Jose Fuentes <josecarlosfuentes@yahoo.com.ar> wrote:
> 
> It would be interesting to post a message like this in
> a PIC or Motorola related forum. Programmers that use
> PICs like the reduced instruction set (some pics have
> only 33 instructions), but this is important only if
> you write assembly code.  I compared Atmega16 and
> PIC18F452 and the latter one has 34 I/O (only 33 if
> you use an external crystal), 1536 bytes RAM, 32K
>FLASH and 256 bytes EEPROM.  Prices are similar but I
> have chosen Atmega16 because of the speed.  Also, a
> time ago I worked with PIC16C65A and it had a lot of
> bugs so the code needed to be tricky.
> 
> 
> Jose
> 
>> --- In AVR-Chat@yahoogroups.com, NGUYEN NGA VIET
>> <vnn_hi@y...> wrote:
>> > Anyone can tell me about the advantages and
>> dissadvantages of AVRs ?
>> > Or, why did you choose an AVR for your jobs ? In
>> what kinds of 
>> projects, AVRs are the best choice ?
>> > Thank you.
> 
> 
> 
> 	
> 
> 	
> 		
> ___________________________________ 
> ¡Llevate a Yahoo! en tu Unifón! 
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3 or 4 years ago when I got into microcontrollers the first one I 
came across was the PIC lineup. Done some research on them, printed 
out datasheets and such but bought anything for the PICs.

Then I came across the AVRs. Seemed like they were as good or better 
in most cases but both would do the jobs I had in mind. The selling 
point, being a hobbiest price of all the tools, both hardware 
(STK500) and software (AVR Studio, GCCAVR and CodeVisionAVR) are 
better priced. When it came down to it for me the cost of the tools 
made the difference.

Anyone that has an STK500 knows that Atmel is probably only 
recovering the cost of the thing. But what are you going to do? 
Develope things that use AVRs. Where are you going to get the AVRs?

Back in the 70's Apple got a big grip on the developing personal 
computer industry buy practically giving Apples to the schools. Once 
a student got out on their own what computer are they most likely buy?

Of all the personal computer manufactures of the 70's as far as I 
know only Apple is still around. If they are around they are making 
IBM PC compatable computers. What ever happen to Tandy? Screwed their 
customers with almost compatable IBM PCs.

Mike


--- In AVR-Chat@yahoogroups.com, "Dingo" <nsjunklists@h...> wrote:
> AVR has a free C compiler. As a hobbyist free is important. The 
only freely available PIC compilers are demos of commercial ones and 
the limitations always get in the way.
> 
> http://winavr.sourceforge.net/
> 
>   ----- Original Message ----- 
>   From: Zack Widup 
>   To: AVR-Chat@yahoogroups.com 
>   Sent: Wednesday, December 08, 2004 7:08 AM
>   Subject: [AVR-Chat] Re: advantages and dissadvantages of AVRs.
> 
> 
> 
>   --- In AVR-Chat@yahoogroups.com, NGUYEN NGA VIET <vnn_hi@y...> 
wrote:
>   > Anyone can tell me about the advantages and dissadvantages of 
AVRs ?
>   > Or, why did you choose an AVR for your jobs ? In what kinds of 
>   projects, AVRs are the best choice ?
>   > Thank you.
>   > 
> 
>   I think it's been fairly well covered, but I have chosen AVR's 
>   because of their speed and ease of programming.  PIC's require 
much 
>   more elaborate initialization routines for USART, A/D converter, 
etc. 
>   than the AVR's.  The A/D converter in the AVR's seems more immune 
to 
>   noise. Having 32 general-purpose registers to work with is also a 
>   plus.
> 
>   I'm playing with using a port of an AVR as a hardware DAC (R/2R 
>   ladder).  The speed available makes for a much higher possible 
output 
>   frequency than other devices I've used.  (Note, I'm trying to 
keep it 
>   very simple).
> 
>   Zack
> 
> 
> 
> 
> 
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