topic Re: K82: access to System Register File and VBAT register file in Kinetis Microcontrollers

K82: access to System Register File and VBAT register file

EugeneHiihtaja — Tue, 28 Aug 2018 12:08:27 GMT

Hello !

Could you point me to application/examples for K82 for how-to access to

System Register File 32 byte and 128-byteVBAT register file.

Thank you !

Eugene

miduo — Wed, 29 Aug 2018 08:38:23 GMT

Hi,

You may would like to look at this post on how to access VBAT register

EugeneHiihtaja — Wed, 29 Aug 2018 09:10:39 GMT

Hi !

Do I undestand right :

- VBAT and SR addresses window spaces mapped to AIPSx bridge areas directly

- As result access to VBAT&SR can't be protected by MPU or AIPSx bridge settings

and it is possible to access to those spaces in User execution mode ( And Supervisor as well ) ?

- for enable access to VBAT & SR , bit29 ( RTC access control bit ) should be enabled in SIM_SCGC6 register ?

Regards,

Eugene

EugeneHiihtaja — Thu, 30 Aug 2018 11:11:16 GMT

Hi !

Looks like no any dependencies to RTC clock and line CLOCK_EnableClock(kCLOCK_Rtc0) is not mandatory

for read/write to those Register Files. And there are keep values over reboot operation.

But access with User priviliges cause BusFault.

How ro activate AIPSx type of restriction to those areas and have access with User privileges and able to write protect it from Supervisor accesses ?

Regards,

Eugene