Before even beginning to think about any code, you need to think about what hardware you will use. I just know 8051 programming a bit. So i decided to use it.
You do understand why you lose your data when the power is removed, don't you? Yes. I know why my data loosing. And im trying to solve it. Also i stopped my project about this problem.
Memories that lose their data when power is lost - such as the internal RAM of an 8051 - are said to be volatile;
Memories that do not lose their data when power is lost are said to be non-volatile.
It should be obvious that you have 2 possible approaches here:
1. provide some sort of "backup" supply - so that your (volatile) memory does not lose its power;
2. use some sort of non-volatile memory - so that it does not matter that your memory loses its power.
There are many different ways to achieve each of these - it is your job, as designer, to consider which is most appropriate to the specific requirements & constraints of your particular application...
Thank you. I know all of them. The think i dont know is, Does a 8051 have any non-volatile memory? and how to store my data to there. if 8051 does not have, i will use a 26XX series eeprom. but it will place on my board :(
"Does a 8051 have any non-volatile memory? and how to store my data to there."
Yes, some do. Read your device's data sheet.
Don't start a new thread!
Continue in your original thread: http://www.keil.com/forum/18096
But i didnt! i just relized that i started new one. i think its a system error.do u know How can i delete this one?
No system error. User error! And you can't erase this thread. Just make sure all new facts are posted in the other thread.
"i think its a system error"
No - it's as all-too-common User error: http://www.keil.com/forum/18112/