uart cpu rom ram subsystem this is a followup post to something i ve written previously several people responded with good information but i don t think i communicated exactly what i am looking for i m working on a custom i o device that will communicate with a host via rs my custom circuitry will use an c eb or ec cpu and require about k of ram preferably flash ram in looking around i see that lots of people have engineered uart cpu rom ram subsystems that are ready to be interfaced to your custom i o devices it s been done so much that it would be best if i can avoid reinventing a system it just needs to use an c or cpu and be able to load a program from the host then transfer control to that program well there s one other thing the rom needs to know how to do it should have routines to send and receive bytes to from the host that utilize the hardware control lines dtr rts dts cts everything i ve seen is in the and up range that s too much for this application i need something around the cpu has the uart built in so you re only looking at a few chips does anyone know a company that markets a good board in this range or some public domain circuitry i can use thanks in advance for the info rich
