Hello. I'm trying to understand FPROT Register.
RM 825P
In NVM Normal mode : ~~ << I don't understand this part.
1. Does this mean that protection is only to be able to protect 'erase'?
but I think this doesn't make sense.
because of this
2. "currently unprotected
memory can be protected, but currently protected memory cannot be unprotected."
It sounds like once I protect some register, the protected register will be protected
forever..(unless I do mass erase).
I can't test all flash commands due to its risk.
so I can't help but guessing many things..
3. If I protect some region in Flash, the memory monitor shows protected region as '0'?
4. hopfully, if you don't mind, Could you please show me the code and memory monitor
handling Flash Protection?
Thanks
Best regards,
Phillip
Hello Phillip,
1. The FTFC module on S32K is always in NVM Normal mode.
If a region is protected, it cannot be erased or programmed (except for mass erase) but it can be read.
2.
Yes, that's correct, it can be changed from Unprotected to Protected only.
3.
The debugger and all the other masters on the bus can read protected flash regions.
4.
If you want to protect the first region, which is 16kB on S32K144 (0x0000 - 0x4000), you need to clear FPROT3[0] (36.5.1 Flash protection).
You can changed the Flash Configuration Field in the startup_S32K144.S file so that the flash can be protected out of system reset.
Regards,
Daniel
Hi
Thanks for replying
but not sure yet about protection
So If I protect some region through startup.s file, is there no way to change
to unprotect currently protected region?
(0x40020013 is fprot register address)
But when I change the register's value, it is possible to change from protect
to unprotect..
thanks
Best regards,
Phillip
