UART, built with 74xx TTL

An article about how to build your own UART
(Universal Asynchronous Receiver/Transmitter),
and how to connect it to the RS232 interface of a PC.

(Might also be interesting to read for those using CPLDs.)

Note, that this article contains some large images,
and that you also could download it as Eagle 3.55 schematic.
uart.sch

• Foreword
• Level translator
• Baud Rate Generator
• TX schematic
• TX timing diagram
• TX description
• RX schematic
• RX timing diagram
• RX description

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(c) Dieter Mueller 2007