Lets say you’re even more limited on resources, and only have a single pin for UART. [Ralph] created a software library and a small circuit that enables half duplex UART using only one pin.

Fremont, Calif.—Exar Corp., a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure, announced the industry's smallest form factor single ...

USB-to-serial interface chips are contained in a 3 x 3 mm 12-pin DFN packag. The UART interface IC allows asynchronous serial data transfer, supporting data transfer rates from 300 bits/s to 3 ...