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MSP430 external memory interfacing

sitharaj seenivasan
Prodigy 20 points

Other Parts Discussed in Thread: ADS1292RECG-FE

Hi,

   I'm doing an embedded project by using MSP430 microcontroller. in my project i want more memory(SRAM, Flash) so it is possible to interface external memory with MSP430 family and store the program in that memory(Flash). Thanks. 

  • 0
    Guru 14640 points

    Sitharaj:

    As with many microcontrollers, the MSP430 does not have an external memory interface. That said, you can have external memory by using I2C or SPI accessable memory, or you can "create" am memory interface by using I/O. This has been done on the ADS1292RECG-FE board (TI eval board).

    Hopefully, that helps.

  • 0 in reply to Todd Anderson78572
    Guru 25210 points

    To follow up on what Todd replied, while you can attach external memory to the MSP430 (either serial memory or parallel bus memory), in neither of those cases do you have direct access to the memory - access is through an I/O driver.

    The implications of this is that you cannot execute code directly from that memory nor store data there directly by CPU. All the memory I/O needs to go through function calls to your driver structure.

  • 0 in reply to Brian Boorman
    Prodigy 20 points

    Thank  Todd, Brian for giving quick reply and clarified my doubts at correct time. I have another doubt that is, I want to reload original firmware from external memory to internal memory (MSP430) if internal memory firmware corrupts due to radiation.is it possible in MSP430 family using that type of memory(I2C, SPI, Parallel).

    Sitharaj.  

  • 0 in reply to sitharaj seenivasan
    Guru 14640 points

    Yes, I would think so. And you can put together a checksum of other mechanism on the code stored in external memory (CRC?) so that you can verify that it is okay. Lots of work, though...

     

  • 0 in reply to sitharaj seenivasan
    Guru 227245 points

    It is possible to reload memory from any data source at runtime. The MSP is capable of self-programming. However, the code that would read the backup and write it would be subject to the same destructive influences and may fail as well. And this is true for the backup too.

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