Types of Communication Interface
There are two ways in which a microprocessor can connect with outside world or other memory systems.
Serial Communication Interface
Parallel Communication interface
Serial Communication Interface:
In serial communication interface, the interface gets a single byte of data from the microprocessor and sends it bit by bit to other system serially (or) the interface receives data bit by bit serially from the external systems and converts the data into a single byte and transfers it to the microprocessor.
Parallel Communication Interface:
This interface gets a byte of data from microprocessor and sends it bit by bit to the other systems in simultaneous (or) parallel fashion. The interface also receives data bit by bit simultaneously from the external system and converts the data into a single byte and transfers it to microprocessor.
Consider that we have a microprocessor interfaced to both I/O device and also a memory chip. Now how to select between the two devices according to the requirement?
For this purpose an address decoding circuit is used. An address decoding circuit aids in selecting the required I/O device or a memory chip.
Let us discuss the concept of Memory interfacing and I/O interfacing in the next article.