Hello,
I am using a TM4C129CNCZAD processor.
I am using the hibernation module, but not using a battery as it's source.
I am using just a normal 3.3V power line as the source to VBAT.
I am wondering if the Hibernation Module on the processor has a different "brownout threshold" than the rest of the processor?
I am performing a stress test on my processor. I have the hibernation module enabled, but I do not put the device in hibernate. I remove power for a few seconds and then restore power.
I have a GPIO driven high and I notice that the GPIO reads logic low about 2 seconds before the N_HIB pin comes low due to the power loss.
Case 1: If I restore power before N_HIB goes low, then the hibernation module indicates to me that its still active but the reason for waking was due to the WAKE pin. The cause for reset in this cause was POR.
Case 2: If I restore power after N_HIB goes low, then the hibernation module indicates that the hibernation module is not active and that the cause was POR.
Case 1 is problematic for me because I normally read contents out of the hibernation register. I did not actually hibernate (and thus did not write anything to the hibernation registers), so my CRC check that I do on the contents of my hibernation data fails for me in case 1.
Thanks,
Aaron
