K65 Max UART Baud Rate

michaelsteffenf — Thu, 07 Aug 2014 14:58:45 GMT

Question regarding the max UART baud rate on the K65 is that the input clock needs to be divided by 16, hence the max should be 60MHz (bus clock) / 16 = 3.75MHz. Can anyone confirm this?

The K65 LPUART seems to remove the required divide by 16, but I assume that is to allow for the over-sampling feature. What is the max baud rate on the LPUART?

Mike

Re: K65 Max UART Baud Rate

Hui_Ma — Thu, 14 Aug 2014 09:15:46 GMT

UART0 and UART1 modules operate from the core/system clock, which provides higher performance level for these modules.

The UART0 and UART1 could support up to 180MHz/16 = 11.25MHz.

LPUART baud rate = (ASYNCH module clock)/ (SBR[12:0]x(OSR+1)), the Min. value of (SBR[12:0]x(OSR+1)) is 4.

So in theory, the LPUART baud rate could up to MCGPLLCLK/4 = 180MHz/4 = 45MHz.

While, I don't find any material to support this high speed baud rate for LPUART.

I think LPUART could not work as fast as UART0 and UART1, which used for low power mode mainly.

The LPUART baud rate up to 3.75Mbps sounds reasonable.

Wish it helps.
best regards
Ma Hui

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topic Re: K65 Max UART Baud Rate in Kinetis Microcontrollers

K65 Max UART Baud Rate

Re: K65 Max UART Baud Rate