Not only for human beings communication is important even for silicon chips the communication is very important
In embedded communication can be divided mainly into 2 parts
1. PC to embedded controller communication
2. Embedded controller to embedded controller communication
Even there is another communication method called ASIC communication which happens internally in the ASIC
So now we will see the first part
1. For outside world to communicate with embedded controller a communication is required for example PC sends a command to switch on a relay based on ambient temperature
For this to happen a communication is required, communication means a set of protocol has to be transmitted from PC to Chip , chip has to understand what PC communicates and then has to take decision
In order chip to understand it must recognise first communication started so START bit is initiated and chip also need to understand that communication is terminated generally humans do by telling BYE in this case STOP bit
and chip also should understand that communication is meant for this chip then chip has address has humans has name
and the actual message
so we can tell that communication can be START ADDRESS MESSAGE STOP
but chip also should verify whether received data is correct as transmitted to avoid miscommunication so PARITY is also required
START ADDRESS MESSAGE PARITY STOP
This can be a basic communication from PC to chip
but to transmit data phsically from one place to another place we need physical medium so Tx, Rx, Gnd are minimum needed
Based on number of communication lines and protocols used
1, RS232 communication
2. RS485 communication
3. I2C Communication
4. SPI Communication
6. LIN Communication
7. CAN communication are mostly popular so please read the above communications througly before attending interview best of all
GOOD COMMUNICATION SKILLS ALONG WITH GOOD KNOWLEDGE ON COMMUNICATION PROTOCOLS FETCH YOU A GOOD JOB
BEST OF LUCK
