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MSP430FR6972 FRAM question

Jent
Intellectual 660 points
Other Parts Discussed in Thread: MSP430FR6972

Hi ,SIr

I have a question about writting a data to FRAM.

I written a data to the address which is occupied by my code (example write 0xAA to 0x004480 ), I found that the data of the address was not 0xAA when   I re-up  electricity for MSPFR6972. I think if the address  was occupied by my code, it should not be write other data .  but I found it was written in the address by debugging. what's the reason?

As the MSP430FR6972 datasheet showing ,

I know the code memory range is 013FFFh-004400h,but how could I know the actual address range of my code ?

  • 0
    Guru 299840 points
    Check the MPU registers; the code might be write protected.

    The linker's map file shows the addresses where your code is loaded. Alternatively, look at the address of any function.
  • 0 in reply to Clemens Ladisch
    Intellectual 660 points

    thank you very much，Is "lnk430fr6972.xcl" the linker's map file ?  

    I found the code is following, the 4400h-FF7Fh is protected ,So I couldn't write the address could it?

    // ---------------------------
// Memory Protection Unit (MPU) border
//

-Z(CONST)MPU_B1

// ---------------------------
// Constant data
//

-Z(CONST)DATA16_C,DATA16_ID,TLS16_ID,DIFUNCT,CHECKSUM=4400-FF7F

// ---------------------------
// Memory Protection Unit (MPU) border
//

-Z(CONST)MPU_B2

// ---------------------------
// Intellectual Property Encapsulation (IPE)
//

-Z(CONST)IPE_B1=4400-FF7F
-Z(CODE)IPECODE16
-Z(CONST)IPEDATA16_C,IPE_B2

// ---------------------------

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