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???
05/24/12 16:08
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 		 #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            01/01/70 00:00      
   Numbers always help            01/01/70 00:00      
   Trying to read your mind            01/01/70 00:00      
   Write down your project requirements            01/01/70 00:00      
      Details            01/01/70 00:00      
         Most projects do not need external memory            01/01/70 00:00      
            SILabs have 8-porters            01/01/70 00:00      
               Don't overlook the additional memory ...            01/01/70 00:00      
            Further Details and Thankyou            01/01/70 00:00      
               AT89S8253 ?            01/01/70 00:00      
                  This worked. Thanks            01/01/70 00:00      
                     Hold your horses            01/01/70 00:00      
                        F-RAM            01/01/70 00:00      
                           Yes! I like 'em, and there's no write delay            01/01/70 00:00      
                        3 things            01/01/70 00:00      
         some or all?            01/01/70 00:00      
            Re:some or all            01/01/70 00:00      
               how much and can you            01/01/70 00:00      
               Options            01/01/70 00:00      
   Had you read the datasheets ...            01/01/70 00:00      
      sorry            01/01/70 00:00      
         I doubt it'll hurt you ...            01/01/70 00:00      
            WOW            01/01/70 00:00      
               Yes            01/01/70 00:00      
               Well, it is a troll, as someone has pointed out ...            01/01/70 00:00      
                  "his" money            01/01/70 00:00      
                     You're probably right. It's a shame, but it's so            01/01/70 00:00      
            Is that true?            01/01/70 00:00      
               I doubt it ...            01/01/70 00:00      

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