FCCU Exception from MEMU

[Manjunatha S]

Posted on May 22, 2018 at 13:47

HI,

I found an FCCU exception while running some code in Stop mode in SPC58NE84C3(6M). The source for the FCCU is from MEMU(MEMU_RAM_UCE_22)  but i do not know why this error is occurring. Since i'm using Isystem IC5500 debugger which doesn't support low power debugging for 6M variant in my case. Please have a look at attached SFR info and let me know if further info. is needed.

#fccu #automotive-microcontrollers #spc58 #memu

[Erwan YVIN]

Posted on May 23, 2018 at 10:13

Hello  ,

28

SR_UCE

System RAM ECC and MBIST Uncorrectable Error Detect flag.

Asserted when:

– A new System RAM ECC and MBIST uncorrectable error is detected

– A new entry to the uncorrectable error reporting table is done (either by CPU or

module)

0 No new and unique error detected.

1 New entry in uncorrectable error reporting table is made.

This error can not be corrected from FCCU.

it seems to be relative to the STOP mode

I have requested some help from some experts.

                Best regards

                                         Erwan

[Erwan YVIN]

Posted on May 23, 2018 at 10:45

Hello ,

we have missed in your log :

      SYS_RAM_UNCERR_ADDR = 010B7AC8

        ERR_ADD = 010B7AC8

0x01000000 0x01FFFFFF 16 MB 5888 KB Large Flash Blocks �? no overlay

it seems to be a bad fetch in your program.

did you stop the flash in the STOP mode ?

                Best regards

                                        Erwan

[Manjunatha S]

Posted on May 25, 2018 at 14:14

Hi 

Erwan,

Thanks for the response.

well

a const structure variable is stored in 0x

010B7AC8.

I did not stop the flash in stop mode. In fact i don't even know whether it is enabled or stopped in stop mode, please let me know is there any way to check it.

Is flash wait state affects the bad fetch?

Thank you,

Manjunatha

[Erwan YVIN]

Posted on May 25, 2018 at 15:25

Hello Manjunatha,

Sorry, I have not the right to discuss 58 family on this forum.

Please contact :

https://my.st.com/content/my_st_com/en/support/support-home.html

 

                 Best regards

                                  Erwan