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Register Protection of SPC560Dxx

Central SUPPORT
Senior II

I do not quite understand paragraph 29.3 "Modes of operation" of RM0045 Reference Manual for SPC 56D Line MCUs. It says:

0690X0000087uE0QAI.png

  1. Can my firmware change the protection dynamically, i.e. protect resp. unprotect registers?
  2. Is there any register that can get the source of reset?

                                                

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1 ACCEPTED SOLUTION

Accepted Solutions
Central SUPPORT
Senior II

1) You should activate the register protection of the safety related registers.

There are 2 possibilities to protect the registers either with hard or soft lock protection:

  • if a register is protected by the "hard lock", only a reset can remove the lock
  • if a register is protected by the "soft lock", the software can remove the lock.

From the safety standpoint, the hard lock is a better choice because even if the software "gets crazy" it can't remove the lock.

2) Yes, the user can read the source of the last reset by looking at the status registers of the RGM, FES and DES.  

View solution in original post

1 REPLY 1
Central SUPPORT
Senior II

1) You should activate the register protection of the safety related registers.

There are 2 possibilities to protect the registers either with hard or soft lock protection:

  • if a register is protected by the "hard lock", only a reset can remove the lock
  • if a register is protected by the "soft lock", the software can remove the lock.

From the safety standpoint, the hard lock is a better choice because even if the software "gets crazy" it can't remove the lock.

2) Yes, the user can read the source of the last reset by looking at the status registers of the RGM, FES and DES.