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Instructions MEMRD, MEMWR don't answer

Other Parts Discussed in Thread: CC2520

Hi, I have a problem with the instructions MEMRD and MEMWR. I'm using the CC2520.

Instructions REGRD and REDWR all work correctly. When I send a command MEMRD, the circuit  always get the status.

E.g sending a string 0x10 0x40 0x00 IC always sends status. Can anyone give the syntax how to read and write to the memory SREG.

 

Can anyone help?

 

Thanks, Pawel