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Per Westermark
12/01/10 05:27
Read: 914 times

#179787 - Depends on how to compare
Responding to: Andy Neil's previous message
Well, the thing is that the cheapest ARM chips are probably not cheaper than the cheapest 8051 chips.

But even very cheap ARM chips often have features that the cheapest 8051 chips does not have. So the optimum ARM chip can very well be cheaper than a corresponding 8051 chip. Especially if you need several UART, or CAN or an USB device or a bit more RAM.

And when using a small ARM, you normally have access to a number of big-brothers that are code compatible (including peripherials) but has one or more of:
- more pins
- more peripherials
- more memory
- faster core
- ...

So there are good growth potential in case a product suddenly ends up moving into a niche you hadn't originally planned. Designing initially for "optimum" can only be done when you can be 100% sure that you know everything. That is easy for a lamp timer. But for a large number of niches, you can't get the required customer feedback until the customers have been allowed to play with prototype units. The customers just can't visualize the product, so they can't describe what they consider important features to make your product stand out. And the developer often have completely different views of the product, so the developers can't switch hat and pretend to be a potential customer. Especially if the product is intended for users who are not too interested in technology, where there are a very big gap between developers and customers in expectations and way to use the product.

Few products needs the optimum bit operation you get from a 8051 processor with its bit instructions. So what the 8051 is very good at is normally not a critical feature.

List of 32 messages in thread
[ARM] Any good introduction to ARM assembler?      Jan Waclawek      12/01/10 02:57      
   Every experimenters moving to ARM??      JecksonS Ben      12/01/10 03:12      
      Large span of capabilities with same tools etc      Per Westermark      12/01/10 03:34      
         Cheaper?      Andy Neil      12/01/10 03:56      
            Depends on how to compare      Per Westermark      12/01/10 05:27      
               How very true      Andy Neil      12/01/10 05:53      
               a caveat      Erik Malund      04/20/11 08:12      
                  Picking the right tool for the job.      Christoph Franck      04/21/11 02:08      
                     sometimes you are not the picker      Erik Malund      04/21/11 08:51      
                        Cortex NVIC behavior.      Christoph Franck      04/21/11 10:57      
                           the way I read it      Erik Malund      04/21/11 14:02      
                              A question if registers needs to be saved      Per Westermark      04/22/11 01:19      
                              Possible cases:      Christoph Franck      04/26/11 01:38      
         luckly      JecksonS Ben      12/01/10 05:32      
            Lucky??      Andy Neil      12/01/10 05:49      
      don't know about experimenters, but ...        Erik Malund      01/04/11 05:35      
         Easier to jump between many architectures now      Per Westermark      01/04/11 07:13      
   Have you tried...      Andy Neil      12/01/10 03:59      
      Is this a way to say "no"? ;-)      Jan Waclawek      12/01/10 06:03      
         In the absence of a recommendation...      Andy Neil      12/01/10 06:22      
   ARM assembly is fairly "plain" ...      Christoph Franck      12/01/10 05:55      
      RealView      Andy Neil      12/01/10 06:01      
      shorter, better...      Jan Waclawek      12/01/10 06:19      
         Just dive right in.      Christoph Franck      12/02/10 01:30      
            Not trivial either      Per Westermark      12/02/10 08:19      
               Valid points, but ...      Christoph Franck      12/03/10 04:15      
            none, then?      Jan Waclawek      12/02/10 13:43      
   related thread on LPC2000 yahoo group      Jan Waclawek      01/04/11 05:10      
   Erik found something      Andy Neil      03/09/11 10:48      
   Re: [ARM] Any good introduction to ARM assembler?      Gopal Amlekar      03/12/11 01:06      
   Check this link      AP Charles      04/23/11 05:50      
      Why? How is it relevant?      Andy Neil      04/23/11 08:45      

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