Does the LPUART in MKW41Z have TX and RX FIFOs?

[ppd]

In the MKW41Z512 reference manual, in the chip configuration chapter it says: "The LPUART0 module RX and TX FIFOs are 8 entries each." However in the LPUART chapter bellow nothing is mentioned about the FIFOs. Also, judging from the drivers it seems that there are no LPUART FIFOs on board of the MKW41Z... Is the statement in chapter 3 wrong?

[chris_brown · Accepted solution]

Hi ppd‌,

MKW41Z512 (as well as MKW31Z, and MKW21Z) do have the FIFO. The depth is 8 data words.  Some information was erroneously left out of the documentation.  I have taken a note to update the reference manual.  

You can check the reference manual for the KL28Z 72-96MHz to see the registers and their bit descriptions (on pages 819-822).  That reference manual is located here: https://www.nxp.com/docs/en/reference-manual/MKL28ZRM.pdf . One thing to note is that this device includes registers that are not included on KW41Z/31Z/21Z, so the KW41Z register set will start at offset 0x10.  To put that a little more simply, on KW41Z the LPUART_FIFO register is located at address 0x4005_4018 and the LPUART_WATER register is located at address 0x4005_401C (not at offset 0x28 and 0x2C as in KL28Z).

Hope this helps. Please let us know if you have further questions. 

Regards,

Chris