UART Design

Philipp Wagner
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

State Machines

_images/state-machine.png

Image courtesy Wikipedia

Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

UART

Two wire serial connection protocol

_images/ehw5-uart.jpg
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

The EHW5 UART: Set to 3.3V!

_images/ehw5-uart-top.jpg
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

UART protocol

The UART protocol sends a start bit, 8 data bits and a stop bit

_images/uart-timing-diagram.png

The idle state is high, so start bit is low. The stop bit is high.

_images/uart-example.png
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

Exercise 4: Hardware

_images/uart-wiring.png
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

The EHW5 UART: Set to 3.3V!

_images/ehw5-uart-top.jpg
Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.

Exercise 5

Two exercises

The UART to USB will need a suitable terminal program on the PC (Teraterm on PC, screen or miniterm on Mac/Linux).

Copyright (C) 2017 Embecosm Limited. Freely available under a CC-BY-SA license.