Fun and Easy UART - How the UART Protocol Works

Learn how the UART Protocol works. A universal asynchronous receiver/transmitter is a computer hardware device for asynchronous serial communication in which the data format and transmission speeds are configurable. The electric signaling levels and methods (such as differential signaling, etc.) are handled by a driver circuit external to the UART.

1. UART

2. UniversalAsynchronousRecieverTransmitter

3. Master
Clock (SCL)
Data (SDA)
R1
R2
SlaveI2C
Master SPI
Slave
Serial Clock (SCK)
Master In Slave Out (MISO)
Slave Select (SS)
Master Out Slave In (MOSI)

4. Asynchronous = No Clock

5. Receiver and Transmitter
Need to be on the Same
Baud rate / Bitrate

6. UART Configuration (Serial Comms)
Device 1
TX
RX
RX
GND
TX
Device 2
GND

7. Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Baud Rate
Data Bits
Parity
Stop Bits

8. Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Baud Rate :
1200
4800
9600
19200
38400
115200
bps

9. S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Data Bits
S

10. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Data Bits
S
Ack
D1D0 D3D2 D5D4 D6D7
8 Bits

11. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Data Bits
S
Ack
D1D0 D3D2 D5D4 D6D7
7 Bits

12. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6P
Odd EvenP

13. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6POdd EvenP
11 1 10 0 0
4 –Ones

14. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6POdd P
11 1 10 0 0
4 –Ones
0

15. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6P P
11 1 10 0 0
4 –Ones
1
Even

16. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6P P
11 1 10 0 1
5 –Ones
0
Even

17. D1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Parity Bit
S
Ack
D1D0 D3D2 D5D4 D6P P
11 1 10 0 1
5 –Ones
1
Odd

18. TD1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
Stop Bit
S
Ack
D1D0 D3D2 D5D4 D6P
11 1 10 0 11
T

19. TD1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
2 Stop Bits
S
Ack
D1D0 D3D2 D5D4 D6P
11 1 10 0 11
TT

20. TD1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
S
Ack
D1D0 D3D2 D5D4 D6P
11 1 10 0 11
T
0 1

21. TD1D0 D3D2 D5D4 D6D7S
Communication Settings
Device 1
TX
RX
RX
GND
TX
Device 2
GND
S
Ack
D1D0 D3D2 D5D4 D6 T
D7

22. https://www.arduino.cc/en/Serial/IfSerial
Link Down Below
In Description

23. ASCII

24. Thank you for Watching
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