In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Ray,

at 75 MHz, you would need to call the interrupt routine that handles the serial transmission for 1M Baud every 75th clock cycle, so this is a reasonable value, and I think the transmission will be stable enough.

When you also want to receive asynchronous serial data at that baud rate, things become more problematic as you normally should poll the serial input line at least three times faster than the baud rate. This would mean that the ISR should be invoked every 25th clock cycle. This does not leave much room for instructions inside the ISR, and "steals" away a lot of exeution time from the main program.

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