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CC2340R5: Will .ccfgSector-bit erase protect CCFG during chip erase?

Oscar Schenström
Prodigy 10 points
Part Number: CC2340R5

Tool/software:

Is it possible to write/erase protect the CCFG so it can only be flashed once and then not affected when the Serial ROM Bootloader performs Chip Erase?

From what I have read in the datasheet for CC2340 it is not possible since the CCFG is always erased when Bootloader performs Chip Erased. But in Table 9-3 in the User Guide, there is also a bit in .flashProt area named ".ccfgSector - Protect CCFG Sector" that does not have any explanation other than "0 = Protected (default = 1). What is the meaning for this bit if the CCFG is always erased during chip erase?

  • +1
    TI__Mastermind 34950 points

    Hi,

    Oscar Schenström said:
    From what I have read in the datasheet for CC2340 it is not possible since the CCFG is always erased when Bootloader performs Chip Erased.

    This is correct.

    Oscar Schenström said:
    bit in .flashProt area named ".ccfgSector - Protect CCFG Sector"

    This protects against application code from erasing the CCFG.

    Any firmware to be programmed with SACI (JTAG) or ROM bootloader should have a CCFG associated with it and follow the sequence(s) described in the User Guide.
    Over-the-air update -capable applications will have a separate firmware section (MCUBoot) on the device which can load in a new application fw and leave the CCFG untouched.

    Thanks,
    Toby