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What is the maximum UART throughput of KL15?

Question asked by Kelvin Vo on Nov 6, 2013
Latest reply on Feb 18, 2014 by Mark Butcher

I'm using MKL15Z128VFM4 on custom board:

  • Crystal 7.3728MHz
  • Core clock 44.2368MHz
  • Bus clock 14.7456MHz
  • UART0 & UART1 are initialized to 921600 baud rate

I need to transfer data between two UARTs at high speed, but the UART hardware buffer is one byte and that means there will be one interrupt for every byte comes into or out of the UART.

What is the maximum data throughput the MCU can achieve?

At that maximum speed, how much processing time is left?