How to use the RTC component in PE for Kinetis KL15 48 pin package?

[StephenLau]

Hi,

I want to use the RTC component in PE for the Kinetis KL15 48 pin package. I find that I have no means to configure the CPU clock setting and the RTC component clock source setting to have no problem. Any reference project could show how to?

Thanks for your great help.

Best Regards'

Stephen Lau

[StephenLau]

I am using CW 10.3.

In PE, it shows that the internal 32kHz oscillator is not supported by the HW ! Why??

Best Regards'

Stephen Lau

[MVa]

Hi,

  selected MCU has no direct path to the RTC_CLKIN pin or to the Internal 32 kHz oscillator. (Those direct paths may be present on different MCU derivatives). You have to select ERCLK32K clock signal in the RTC_LDD component and connect RTC_CLKIN pin to this signal in the CPU component. See attached pictures.

Best Regards

MVa

[StephenLau]

Hi,

By your suggestion, I could pass the compilation, but the RTC Time Seconds Register (RTC_TSR) does not increment during debug. I guess the RTC_CLKIN has to be input 32768Hz. Is it correct?

Thanks so much.

Best Regards'

Stephen Lau

[MVa]

Hi,

  Yes, you are right. RTC peripheral requires 32,768 kHz input clock.

MVa

[StephenLau]

Hi Marek Varecha,

Alright. Thanks so much for your clarification.

Best Regards'

Stephen Lau

[LucioCanche]

I have the HW oscillator (2 pins). One of his pin is connected  to PTC1 (RTC_CLKIN). Where should I connect the other?

Lucio

[StephenLau]

Hi MVa,

Thanks so much for your informative reply.

I have a questions that do I really need to add the 32768Hz clock to the hardware pin RTC_CLKIN? My hardware platform only has the external 8MHz system clock to the MCU, and the pin is used up by other usage.

Best Regards'

Stephen Lau