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KL82Z - UART clock accuracy issue with 4MHz internal clock?

Question asked by nickbedbury on Jun 29, 2018
Latest reply on Jun 29, 2018 by Mark Butcher

I'm using the FRDM-KL82Z eval kit to send bytes from LPUART0 at 115200.    The board is configured to use the 4MHz internal clock.

 

After testing 10 eval kits, about 50% exhibit framing errors in the UART bytes.  There are no errors if the UART is run at 100000 baud (which happens to be an integer divisor of the 4MHz internal clock...).

 

We are using Kinetis SDK 1.3.0.

 

Are there any known issues with the KSDK LPUART software driver related to this?  Or hardware errata perhaps?

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