Software flow-control character configuration
XON_THRESHOLD | When the data amount in Rx-FIFO is less than this register value with uart_sw_flow_con_en set to 1 it will send a Xon char. |
XOFF_THRESHOLD | When the data amount in Rx-FIFO is more than this register value with uart_sw_flow_con_en set to 1 it will send a Xoff char. |