USB-to-serial interface

摘要

A previous Interface described a circuit based on an FT245RL chip that provided an output port without the need for a microcontroller to handle the flow of data from the PC. Instead, some simple control logic was used to provide a latching output port. The control logic also provided a pulse each time a fresh byte of data became available, which, in practice, would be used to indicate to the main circuit that new data had to be processed.