ARCHITECHTURE OF 8085 MICROPROCESSOR part1

The functional block diagram or architecture of 8085 Microprocessor is very important as it gives the complete details about a Microprocessor.

 Fig. shows the Block diagram of a Microprocessor.

8085 BUS STRUCTURE

 address bus:-

• The address bus is a group of 16 lines generally identified as A0 to A15. 
• The address bus is unidirectional: bits flow in one direction-from the MPU to peripheral devices.
• The MPU uses the address bus to perform the first function: identifying a peripheral or a memory location.  

DATA BUS:-

• The data bus is a group of eight lines used for data flow.
• These lines are bi-directional - data flow in both directions between the MPU and memory and peripheral devices.
• The MPU uses the data bus to perform the second function: transferring binary information.
• The eight data lines enable the MPU to manipulate 8-bit data ranging from 00 to FF (28 = 256 numbers).
• The largest number that can appear on the data bus is 11111111

 Control bus:-

• The control bus carries synchronization signals and providing timing signals.
• The MPU generates specific control signals for every operation it performs. These signals are used to identify a device type with which the MPU wants to communicate.

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