Bus Structure of 8085 Microprocessor

Hello friends, today we are going to discuss the bus structure of the 8085 microprocessor.

The microprocessor MPU is a programmable integrated device and performs various operations with peripheral devices by using three sets of communication lines called buses. buses are nothing but a group of wires which carries data to supply from one device to another device. There are basically three types: the address bus, the data bus and the control bus. And these three combined lines are called a system bus.

Bus Structure of 8085 Microprocessor

Address bus:

An address bus is a group of 16 lines generally called A0 – A15 to carry a 16-bit address of memory location.

In a computer system, each peripheral or memory location is identified by a Hexadecimal number called an address. It represents 0000 H to FFFF H . H means hexadecimal no. This is similar to the postal address of a house.

The address bus is unidirectional, which means bit flow in only one direction from MPU to the peripheral.

MPU carries 16-bit address i.e. 2¹⁶= 65,536 or 64K memory locations.

Data Bus:

A data bus is a group of eight bidirectional lines used for data flow in both the directions between MPH and peripheral devices. The 8 data lines are manipulating 8-bit data ranging from 00 to FF i.e. (2⁸ = 256) numbers from 0000 0000 -1111 1111. This 8-bit data is called word length and the register size of a microprocessor and MPH is called an 8-bit microprocessor.

Control bus:

The control bus is having various single lines used for sending control signals in the form of the pulse to the memory and I/O devices. The MPU generates specific control signals to perform a particular operation. Some of these control signals are memory read, memory write, I/O read and I/O write.

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