Dear sir ,
thanks for ur reply. please can able to tell me write protection is used in our FRAM-25v02A.
1.why used write protection (WP)?
2.what is necessity of write protection (WP)?
3.why write protection (WP) provided?,if I am not used it what problems will come?
please explin in brief:
The Write protect feature is used to prevent any inadvertent write to the memory (FRAM). If the control signals to the FRAM is not applied properly then there is a possibility of data corruption( Say WE and CE are low and you did not intend for that to happen. So it can initiate a write operation).
On details of how to use it you can refer to the datasheet itself on page 7 which explains the complete features.
If you do not want to use the write protect feature you can just connect the WP pin to VDD. There are no side effects of not not using this feature. So you will not observe any problems.
The part we are discussing about is a FRAM part and not an EEPROM. FRAMs cannot be erased. You will simply have to overwrite the data in the FRAM with new data if you want to remove the previous data.
thanks for your reply.In FRAM --we wcanot erase memory .If I used any EEPROM ,plz give ur valuable suggestion how I erase the EEPEOM?