program algorithm to store changed value

[uday mehta]

(for 8051 or any other micro-controller)
In my program I have a variable
u= 2;
another variable
v= user defined(user can enter any no using keypad);

now
u=v
will it change the value of "u" permanently? I mean when I will turn of the system and then turn it on again "u" will again get value 2.
I want that value of "u" will be remain same as "v" until I change the value of "v".
Is it possible?

 

[Easyrider83]

You should use eeprom.

 

[uday mehta]

You should use eeprom.

at89s52 has eeprom.
so you say that even power is off the value of U will remain same as last value of V?

 

[Allen6502]

According to the at89s52 datasheet page 1, it doesnt have eeprom. So an external one is needed. See pdf attached.

Allen