Processor Expert Software中的主题 Re: MPC5777C CSE and UTEST region reading problem

MPC5777C CSE and UTEST region reading problem

oloo — Mon, 25 Jan 2021 21:32:45 GMT

Hi,

I am facing problem with reading CSE and UTEST of MPC5777C. Reading function just stops.

I can successfully read any other flash region except CSE and UTEST. What could be the issue?

Should i additionally enable those regions?

lukaszadrapa — Tue, 26 Jan 2021 07:02:26 GMT

Hi,

this is expected behavior:

Regards,

Lukas

oloo — Tue, 26 Jan 2021 12:03:47 GMT

Thank You for the hint. So regarding documentation after:

C55FMC.TMD.R = 0x2D3C4B5A;

i should be able to read UTEST unless pass is changed. And fter correctly setting LOCK1 registers i should be able to write.

I mean to set PASS_LOCK1_PGn i have to modify UTEST DCF records.

am i right?

oloo — Tue, 26 Jan 2021 12:26:49 GMT

Could You please give me more hints, still i cant read UTEST area.

Documenattaion says "UTest NVM block is enabled only when MCR[PEAS] is high"

so i am doing:

M55FMC.TMD = 0x2D3C4B5A;

Once the next reset is asserted, Test mode will be disabled.

and after that i am setting MCR[PEAS] = 1;

but still cant read UTEST. What other steps has to be taken?