Get reset reason in MPC5748G

charlie_wang_ff · ‎03-17-2017

I would like to know the way to know the reason of a reset in MPC5748G:

Is the reset cause by

* Power on reset

* Watchdog timer time out

* self-test failed

* ...

Is there a register that I could check to find out the reset reason?

petervlna · ‎03-20-2017

Hi,

In RGM (reset generation module) you can see reset sources in FES and DES registers.

Peter

travis_kuo · ‎10-04-2018

If I want to detect (cold) power-up, it looks I can check F_POR bit of the register MC_RGM_DES.

Q1: does our SW needs to write 1 to F_POR of the register MC_RGM_DES to clean it after boot-up?

Q2: the RM mentioned only allowed to write it in test mode mode or supervisor mode. What is the test mode here?

petervlna · ‎10-08-2018

Hi,

A1: it is not necessary, but I recommend it. So, you can track last reset source when a failure occurs in your system.

A2: Test mode is not available for customers. You must use Supervisor mode. Supervisor mode is intended to be used for micro configuration.

Peter

travis_kuo · ‎10-08-2018

During my test I found F_POR bit of the register MC_RGM_DES can be cleared by set 1 in user mode. No need to switch to supervisor mode.

Any comment for this?