[ARM] Nxp p89lpc921 has eeprom?without eeprom how can store data?

[arunbharathi.arasu]

hai friends,
Does lpc921 has inbuilt EEPROM?
if no,without using EEPROM ho can we store data in that.
i have one home automation product, In that product they are using LPC921.
External EEPROM is not available in that product.
but when i switch off and on the power, the previous state will retain.
i saw LPC921 datasheet,there is no details about about EEPROM.
Without using EEPROM,how the previous state will retain?
Any one please help me.....
Thanks in Advance.......

 

[Vengateswaran]

You have to connect external EEPROM and access it by using any communication protocol.

 

[arunbharathi.arasu]

In that product there is no external EEPROM available.... Then how the previous sate will retain....

 

[jayanth.devarayanadurga]

Maybe the data is written to Flash memory.

 

[arunbharathi.arasu]

how it can be done in real time.... can u tell me the instruction or code.....

 

[Vengateswaran]

You have to get external EEPROM and have to interface it manually. After that, use any protocol for accessing the data in both ways.

 

[jayanth.devarayanadurga]

how it can be done in real time....

What to you mean by that? The same way eeprom is written, flash can also be written. Do you think flash is only written during programming the chip? I don't know about your LPCxxxx chip but in PIC there is flash read and write functions which can be used to write data to flash memory.

 

[arunbharathi.arasu]

hai vengateswaran,
Actually my problem is, how to store data without using EEPROM(internal/External).
when i restart my controller, the data will retain.

- - - Updated - - -

ok.i will try... thanks jayanth.

 

[Venkadesh_M]

Hi by trying to write in program memory will give you pabort, you can not do that in a ARM7, Try configuring external EEPROM..

 

[arunbharathi.arasu]

ok.... THankyou......