I read a lot about UART. i can see that most of the application using PIC. I'm wondering is it possible to apply the theory of UART without using PIC and only using IC combinations?

 

The short answer is yes you could but it would be easier to use a PIC or buy an UART IC.

 

I read a lot about UART. i can see that most of the application using PIC. I'm wondering is it possible to apply the theory of UART without using PIC and only using IC combinations?

A parallel-in serial out shift register, a couple of flip-flops, and some gates can be used to make a UART Transmitter. Similarly a serial in parallel out shif register, some flip-flops, and some gates can be used to make a UART receiver. It is how we used to do it before there was such a thing as a UART.