The I/O cells of the UARTs of Oki Advantage Microcontrollers are capable of handling data rates in excess of 512 Kbps. However, the maximum data rate depends on the performance of the application software running on the MCU. In other words, how fast can the application software respond to requests from the UART, and what other events does the application software have to respond to at the same time of servicing the UART. If the application software is burdened with responding to other events such as interrupts from other peripherals or processing other information, it may not be able to service the high data rate demands of the UART.

In sample trials carried out at room temperature, Oki engineers have been able to transmit and receive at transmission rates in excess of 512 Kbps on the 16550 UART peripheral of ML674K and ML675K Advantage Microcontrollers. The SIO port of Oki's ML674K Advantage Microcontrollers generally has a lower data rate performance due to the fact that it does not have buffers. Thus it is more prone to line errors.

In conclusion, data rates of up to 512 Kbps are possible on the advantage microcontroller UART. Users should evaluate the maximum data rate possible in their application based on their own application software and application demands on the MCU.