If you evaluate UART reception error for example frame error and parity error, use this sample project.
When you send data from the terminal software of your PC, the sent data will be echoed back. Then, the sent data is output with the set baud rate, parity, and stop bit length.
It is also possible to change the polarity of the stop bit to generate an error.
To enable 230400bps, make the following settings.
The baud rate of the Pseudo UART is set by the timer Period.
You can change the polarity and bit length of the stop bit, none, even, odd of parity on the line with # in the comment in main.c.
PSoC 4 MCU