The maximum clock frequency for the SC16C2550BIA44 is 24 MHz.
To configure the UART for 9-bit data transmission, set the MCR[7] bit to '1' and the LCR[0] bit to '1'. This enables 9-bit data transmission with the 9th bit being the parity bit.
The XOFF and XON characters are used for software flow control. XOFF (typically 0x13) is sent by the receiver to the transmitter to request it to stop sending data, and XON (typically 0x11) is sent by the receiver to the transmitter to request it to resume sending data.
The SC16C2550BIA44 can be reset by asserting the RESET pin low for at least 100 ns. This resets all registers to their default values.
The maximum baud rate deviation allowed for the SC16C2550BIA44 is ±3.5%.