In general, Kinetis KL26 UART module is using hardware flow control, while customer also could use XON/XOFF software flow control.
While, we don't have dedicated XON/XOFF example based on Kinetis product.
We have that XON/XOFF flow control example at ColdFire MCF5213 application AN3897, please check AN3897SW for XON/XOFF flow control example.
The related code at <serial_s19.c> & <serial_s19.h> files.
Wish it helps.
Have a great day,
Ma Hui
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