The main purpose of communication is to transfer information from source to destination. Communication between Microcontroller have two ways to transmit data on line.
1-Serial Transmission
2-Parallel Transmission
Serial Transmission
When using the Serial Transmission, we transmit only one bit at a time. It simply means there is only one transmission line through which the bit is transmitted.
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| Serial communication |
Parallel Transmission
When using the Parallel Transmission, we transmit an entire byte of data at a time. Hence we need 8 lines for transfer 8-bit data.
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| Parallel communication |
In order to understand the Serial communication and the difference between these two. Let's take a look at the following Proteus example.
>> First Open Proteus ISIS
>> Press on P for choosing component.
>> Search COMPIM
>> In virtual instrument 
mode select virtual terminal as show below.
mode select virtual terminal as show below.
>> Make connection as shown below.
>> Now double click on the COMPIM and set the properties as shown below.
>> Here , i have selected COM1 and my baud rate is 9600.
>> Similarly open the property of the virtual terminal and set the baud rate is 9600.
>> Now run the simulation.
>> By pressing any key from your keyboard
, you will see the TXD pin will be high, which indicate that one bit is transfor as shown below.
, you will see the TXD pin will be high, which indicate that one bit is transfor as shown below.
In the next tutorial we will see parallel transmission.
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