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???
05/24/12 10:08
Read: 703 times


 
#187510 - Options
Responding to: ???'s previous message
Here are some options as I see it:

1> Use IAP (In Application Programming) to use some of the on chip flash to store data. Your chip needs to support this, but there are many that do. Try this one http://www.maxim-ic.com/datasheet/index.mvp/id/4078
There are many application notes to help you do this, but it will take a little programming to learn how.

2> Find 2 port pins and wire up a I2C eeprom like this one http://www.sparkfun.com/products/525
You would then save data as it comes in and then load it back up when the MCU turns on. You can even share these pins with other parts of your circuit (called multiplexing). Ask more questions if you want to know about this.

3> As mentioned before, use a battery (such as a cr2032) and try and keep the system from ever completely losing power.
You should adjust your program to use the 8051 low power mode (which is easy) to help you out with this.

--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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