Hi, i am developing an application which implements the keil another Asynchronous port. Here we are using keil ST10168 board. we are having the 8251 as the USART. To connect 8251 with the board,we have taken the 8 bit demultiplexed bus. Can you please tell me how to set the chip select and others fields. How i can know the chip select is connected to my USART. Thanks & Regards Bharathi M.