External RST isnt waking device from hibernation mode. TM4C123G7H6PGEI

Sheldon Blackshire

I'm working with the TM4C1237H6PGEI microcontroller on a custom board, and I have encountered an issue with the Reset signal.I have noticed that while in hibernate mode, when I hit the reset button nothing happens.

I have to enable the VDD3ON register due to the configuration of my LDO(just to enter hibernate), and also because I need to retain GPIO during hibernate. All of my wake features (wake pin, iRTC match) are waking the controller as intended. I went back to the original hibernation example for the Tiva board and even it does not allow the reset pin to function. Has anyone encountered this issue? I can provide code snippets if needed.

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Sheldon

On the TM4C123 the RST pin is not a valid source of wakeup. This feature is only for the TM4C129 device.,

Regards
Amit

0 Sheldon Blackshire over 10 years ago in reply to Amit Ashara

Intellectual 985 points

So the hibernation module overrides reset? That seems odd to me.

0 Amit Ashara over 10 years ago in reply to Sheldon Blackshire

TI__Guru**** 244400 points

Hello Sheldon,

The Reset Pad is not a part of the battery backed supply IO's in VDD3OFF Mode. In the VDD3ON mode the pad value is retained by isolation.

Regards
Amit

0 cb1_mobile over 10 years ago in reply to Sheldon Blackshire

Guru 117855 points

Sheldon Blackshire said:
That seems odd to me.

That said - to make your "sense" of such "oddity" bit more compelling - might you detail your belief? (especially when comparing to "equal-class" MCUs - not aged/inferior {i.e. bit-starved} ones...)

Our tech group uses ARM MCUs across multiple vendors. This separation/reservation of Reset during "special functions" visits other's MCUs as well - defying your finding of, "oddity."

Most always more useful to "support" any claim/demand with facts/substance - presently absent...

0 Sheldon Blackshire over 10 years ago in reply to Amit Ashara

Intellectual 985 points

Ok, thanks for the input. Since I have to operate in VDD3ON mode, looks like I will have to do without the reset button. I have another button wired to the WAKE pin that will have to make do.

0 Amit Ashara over 10 years ago in reply to Sheldon Blackshire

TI__Guru**** 244400 points

Hello Sheldon

Yes. That would work for the TM4C123.

Regards
Amit

Arm-based microcontrollers

Arm-based microcontrollers forum

External RST isnt waking device from hibernation mode. TM4C123G7H6PGEI