[SOLVED] Why we call ROM in 8051 a non-volatile memory?

[Eshal]

Hello experts!

As we know a ROM is a non-volatile memory. It means it can't be erase once written. But in any microcontroller (here I am talking about 8051) whenever we burn a code in the 8051 then it erase its ROM content and rewrite the new code. Its mean the ROM in 8051 is not a non-volatile memory. Isn't the violation of the concept about ROM?

Thank you all.

 

[yadavvlsi]

8051 has EEPROM memory. You can read/write/delete its content. It is non-volatile also.

https://en.wikipedia.org/wiki/EEPROM

 

[Eshal]

Thank you for your reply. I know it has EEPROM. I didn't mention in my post#1 because I want to listen it from you. But now tell me if it is also a type of ROM and it is erasable then how it could be non-volatile? Why can't we say it volatile on the behalf of its erasing and rewritten feature?

Regards,
Princess

 

[yadavvlsi]

Non-volatile means it hold its contents even if power is down. After power-up it will have same contents. On other hand, volatile memory loose it content if power goes down.

 

[Eshal]

Got it. Your answer is point to point. Very good. Thank you very much.