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David Prentice
05/24/12 04:54
Read: 877 times
Wormshill
England


 
#187491 - Write down your project requirements
Responding to: ???'s previous message
Specify the number of external port lines that you need.
Sometimes pins can be shared.

Calculate the RAM / EEPROM that may be needed.

A single chip solution can often avoid any external memory bus.
Your physical chip size then depends on your GPIO requirements.

You seldom need super fast access to all RAM or EEPROM, so it is also worth considering external SPI or I2C chips if you can't find quite enough memory in a single microcontroller.

Your options are very wide. Getting your design requirements down on paper will speed you through.

David.

List of 29 messages in thread
TopicAuthorDate
More Ports or Non-Volatile RAM      Kurt Adam      05/23/12 17:47      
   Numbers always help      Jim Granville      05/23/12 22:17      
   Trying to read your mind      Michael Karas      05/23/12 22:48      
   Write down your project requirements      David Prentice      05/24/12 04:54      
      Details      Kurt Adam      05/24/12 05:48      
         Most projects do not need external memory      David Prentice      05/24/12 06:20      
            SILabs have 8-porters        Erik Malund      05/24/12 07:30      
               Don't overlook the additional memory ...      Richard Erlacher      05/24/12 09:09      
            Further Details and Thankyou      Kurt Adam      05/24/12 08:44      
               AT89S8253 ?      Jim Granville      05/24/12 16:04      
                  This worked. Thanks      Kurt Adam      05/30/12 17:54      
                     Hold your horses      Hans Van Pelt      05/31/12 03:04      
                        F-RAM      Per Westermark      05/31/12 05:31      
                           Yes! I like 'em, and there's no write delay      Richard Erlacher      05/31/12 06:38      
                        3 things      Erik Malund      05/31/12 07:33      
         some or all?      Erik Malund      05/24/12 09:42      
            Re:some or all      Kurt Adam      05/24/12 09:50      
               how much and can you      Erik Malund      05/24/12 10:07      
               Options      David Good      05/24/12 10:08      
   Had you read the datasheets ...      Richard Erlacher      05/24/12 09:06      
      sorry      Kurt Adam      05/24/12 09:22      
         I doubt it'll hurt you ...      Richard Erlacher      05/25/12 08:16      
            WOW      Erik Malund      05/25/12 09:48      
               Yes      Per Westermark      05/26/12 03:32      
               Well, it is a troll, as someone has pointed out ...      Richard Erlacher      05/26/12 07:04      
                  "his" money      Erik Malund      05/26/12 07:54      
                     You're probably right. It's a shame, but it's so      Richard Erlacher      05/26/12 19:31      
            Is that true?      Andy Neil      06/05/12 05:19      
               I doubt it ...      Richard Erlacher      06/05/12 09:55      

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