Dear All,
can anyone help me, how to LOCK FLASH memory of AT91SAM7A3?
Regards,David

You will have to write to the MC_FCR register for each page you want to lock (pages are 256bytes in size). See the data sheet.

FYI: this only locks the page from subsequent writes it does not prevent reads.

So, to lock page 0x0a you would load the MC_FCR with 0x5a000a02
Then you should wait until the the FRDY bit in the MC_FSR = 1
Finally you should check the status of the operation.

This assumes that you have properly set up the Embedded Flash Controller (EFC) for use.

Dear Dfridley, thanks for your reply. MC_FCR register not solve my problem.

How can I protected Flash against reading? I would like to lock my program in flash, that no one could make a copy.

Regards, David

To my knowledge, the AT91SAM devices do not have a way to securely lock them from reading.