EK-TM4C1294XL: How do I generate interrupt from the RTC (32.768Khz clock)?

David Chance

Part Number: EK-TM4C1294XL

I would like to generate interrupt from the RTC (32.768khz) source instead of the internal timers running off the main CPU clock, not just waking up from hibernation, is there an example I can start from? thanks

over 5 years ago

0 Ralph Jacobi over 5 years ago

TI__Guru*** 135355 points

Hello David,

The only interrupt I can think of for the RTC is the RTC Match.

Read Section 7.3.5.2 RTC Match - Seconds/Subseconds Mode of the device datasheet and let me know if you think that will offer the functionality you are looking for here.

0 David Chance over 5 years ago in reply to Ralph Jacobi

Genius 4775 points

What is the interrupt vector for this interrupt?

0 Ralph Jacobi over 5 years ago in reply to David Chance

TI__Guru*** 135355 points

Hello David,

It is part of the interrupt for the Hibernation module itself. Specifically, look for the RTCALT0 bit in the various Hibernation Interrupt registers.

0 David Chance over 5 years ago in reply to Ralph Jacobi

Genius 4775 points

Thank you!

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EK-TM4C1294XL: How do I generate interrupt from the RTC (32.768Khz clock)?