Protecting Flash

[ssk]

Posted on January 22, 2016 at 10:05

Hello Erwan,

For one of the posts, you mentioned about setting following registers along with the accompanying underlined statement. Can you please explain the underlined statement in detail?

If both CW and SC registers should match for values, how the statement 1) can be true?

The best mode for your case is to use the censored mode.

Private Flash Memory Password and censored

1) Set NVSCC0(CW) , NVSCC1(CW) different to 0x55AA. 

    Set NVSCC0(SC) , NVSCC1(SC) equals 0x55AA.

  

   

IMPORTANT : NVSCC0(CW,SC) must be equal to NVSCC1(CW,SC) otherwise your chip will be completely locked.

Thanks in advance.

Mike

[Erwan YVIN]

Posted on January 22, 2016 at 11:07

Hello Mike ,

See Table 11 (cf Attachment)

in FAB Mode

you should have :

NVSCC0(CW) ==NVSCC1(CW)

andNVSCC0(CW) != 55AA

andNVSCC1(CW) != 55AA

NVSCC0(SC) ==NVSCC1(SC)

andNVSCC0(SC) == 55AA

andNVSCC1(SC) == 55AA

if((NVSCC0(CW) !=NVSCC1(CW)) and (NVSCC0(SC) !=NVSCC1(SC))

===> FLASH IS LOCKED

Best regards

Erwan

________________

Attachments :

2016-01-22_103759.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0TW&d=%2Fa%2F0X0000000bZh%2FXQu2eleqVyZc1N_DoPp8h6hXBfLsvjmLUT7IeTbvnhk&asPdf=false