This ppt includes contents for various communication protocols like USART, UART, i2C, CAN, SPI, and USB in brief.

1. COMMUNICATION PROTOCOLS
By: Piyush Bhardwaj
VI Sem (Ece)

2. • Exchange of information from one system to another system
with a medium is called a Communication.
Communication
• A set of rules and regulations is called a Protocol.Protocol
• A set of rules and regulations that allow two electronic devices
to connect to exchange the data with one and another.
Communication Protocol
INTRODUCTION
Communication Protocols
2

3. Inter System Protocol
Used to communicate
between two different
devices
Intra System Protocol
Used to communicate
between two devices
within the circuit board
TYPES OF ELECTRONIC
COMMUNICATION PROTOCOLS
Communication Protocols
3

4. The inter system protocol is used to communicate between two different devices.
Eg. Communication between computer and microcontroller kit.
This is achieved through a inter bus system.
INTER SYSTEM PROTOCOL
Communication Protocols
4

5. UART
Protocol
USART
Protocol
USB
Protocol
Communication Protocols
5
DIFFERENT CATEGORIES OF INTER SYSTEM
PROTOCOL

6. UART PROTOCOL
 UART stands for UNIVERSAL ASYNCHRONOUS TRANSMITTER
AND RECEIVER. UART Protocol is a serial communication
with two wired protocol. The data cable signal lines are
labeled as Rx and Tx. Serial communication is commonly
used for transmitting and receiving the signal. It transfers
and receives the data serially bit by bit without class pulses.
The UART take bytes of data and send the individual bits in
sequential manner. UART is a half duplex protocol. Half
duplex means transferring and receiving the data but not at
a same time.
 Ex: Emails, SMS, Walkie-talkie.
Communication Protocols
6

7. USART PROTOCOL
 USART stands for UNIVERSAL SYNCHRONOUS AND
ASYNCHRONOUS TRANSMITTER AND RECEIVER. It is a serial
communication of two wire protocol. The data cable signal lines
are labeled as Rx and Tx. This protocol is used for transmitting
and receiving the data byte by byte along with the clock pulses.
It is a full-duplex protocol means transmitting and receiving data
simultaneously to different board rates. Different devices
communicate with microcontroller to this protocol.
 Ex:-Telecommunications.
Communication Protocols
7

8. USB PROTOCOL
 USB stands for UNIVERSAL SERIAL BUS. Again it is a serial
communication of two wire protocol. The data cable signal
lines are labeled as ‘D+’ and ‘D-’. This protocol is used to
communicate with the system peripherals. USB protocol is
used to send and receive the data serially to the host and
peripheral devices. USB communication requires a driver
software which is based on the functionality of the system.
USB device can transfer data on the bus without any request
on the host computer.
 Ex: Mouse, Keyboard, Hubs, switches, pen drive.
Communication Protocols
8

9. DIFFERENCES BETWEEN THE
INTER SYSTEM PROTOCOLS
Communication Protocols
9

10. INTRA SYSTEM PROTOCOL
 The Intra system protocol is used to communicate the two devices
within the circuit board. While using this intra system protocols,
without going to intra system protocols we will expand the
peripherals of the microcontroller. The circuit complexity and power
consumption will be increased by using intra system protocol. Using
intra system protocols circuit complexity and power consumption
and cost is decreased.
Communication Protocols
10

11. DIFFERENT CATEGORIES OF INTRA SYSTEM
PROTOCOL
I2C Protocol
SPI Protocol
CAN Protocol
Communication Protocols
11

12. INTER-INTEGRATED CIRCUIT (i2C)
PROTOCOL
 i2C requires only two wires connecting all peripherals to
microcontroller. i2C requires two wires SDA (serial data line) and
SCL (serial clock line) to carry information between devices. It is a
master to slave communication protocol. Each slave has a unique
address. Master device sends the address of the target slave
device and read/write flag. The address is matched to any slave
device and if that device is ON, remaining slave devices are in
disable mode. Once the address is matched, communication
proceeds between master and that slave device and transmitting
and receiving the data starts. The transmitter sends 8-bit data, the
receiver replies 1-bit of acknowledgement. When the
communication is completed master issues the stop condition. I2C
requires only two wires for connecting all the peripherals to the
microcontroller.
Communication Protocols
12

13. I2C PULL-UP RESISTORS
Why given the pull-up resisters in I2C SCL
and SDA line.
Both SDA and SCL lines are open drain
drivers.
Its can be drive output low cannot driver it
high.
For the lines to be able to go high you must
provide pull-up resistors
Communication Protocols
13

14. SPI PROTOCOL
 SPI stands for SERIAL PERIPHERAL INTERFACE. It is one of the
serial communication protocol developed by Motorola.
Some times SPI protocol is also called a 4-wire protocol. It
requires four wires MOSI, MISO, SS, and SCLK. SPI protocol
is used to communicate the master and slave devices. The
master first configures the clock using a frequency. The
master then selects the particular slave device for
communication by pulling the chip select button. That
particular device is selected and starts the communication
between master and that particular slave. The master select
only one slave at a time. It is full duplex communication
protocol.
Communication Protocols
14

15. CAN PROTOCOL
 CAN stands for CONTROLLER AREA NETWORK. It is a serial
communication protocol. It require two wires CAN High (H+)
and CAN low (H-). It was developed by the Robert bosh
company in 1985 for vehicle networks. It is based on a
message oriented transmission protocol.
Communication Protocols
15

16. DIFFERENCES BETWEEN
THE INTER SYSTEM PROTOCOLS
Communication Protocols
16

17. Communication Protocols
17