TM4C1290NCZAD: HIBRTCC overflow

Margherita Pappolla

Part Number: TM4C1290NCZAD

Hi all,

I am new to the embedded software world. I exploited the RCT module inside the Hibernation peripheral to count the passed seconds once the microcontroller is power up.

To do so I read the value of the 32-bit register HIBRTCC which is hardware increased by the external crystal at 32,768 Khz.

My doubt is what happens if the register HIBRTCC goes into overflow. Does the register re-start counting from 0 or it will simply stop? I was not able to find the answer on the datasheet.

Thanks in advance,

Margherita

over 2 years ago

+1 Charles Tsai over 2 years ago

TI__Guru**** 190806 points

Hi,

It will roll over and start from 0 again. You can do an experiment by programming the HIBRTCLD register with a very large value, e.g. 0xFFFFFFF0. The HIBRTCLD value will be loaded to the RTC counter and the counting will start. Since you preload with 0xFFFFFFF0, it should take 16 counts to overflow RTC counter and then roll over again.

0 Margherita Pappolla over 2 years ago in reply to Charles Tsai

Prodigy 20 points

Hi,

thank you for the fast response. I made the experiment as you suggest me, and indeed the counter re-start counting again.

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TM4C1290NCZAD: HIBRTCC overflow