In this post i will cover all those internal architecture of an microprocessor that is the building block of all mobiles, egg htc , android etc anyone can study it in short but explanatory form , not only mobiles, but also computers, leptopes having this basic, which is describe below, in this post i discussed a lilttle about microprocessor but will cover and explain all knowledge about this in different post.
The microprocessor can be programmed to perform functions on given data by writing specific instructions into its memory.
The microprocessor reads one instruction at a time, matches it with its instruction set, and performs the data manipulation specified.
The result is either stored back into memory or displayed on an output device.
The 8085 Architecture
The 8085 uses three separate busses to perform its operations
The address bus.
The data bus.
The control bus.
16 bits wide (A0 A1…A15)
Therefore, the 8085 can access locations with numbers from 0 to 65,536. Or, the 8085 can access a total of 64K addresses.
“Unidirectional”.
Information flows out of the microprocessor and into the memory or peripherals.
When the 8085 wants to access a peripheral or a memory location, it places the 16-bit address on the address bus and then sends the appropriate control signals
Data bus
8 bits wide (D0 D1…D7)
“Bi-directional”.
Information flows both ways between the microprocessor and memory or I/O.
The 8085 uses the data bus to transfer the binary information.
Since the data bus has 8-bits only, then the 8085 can manipulate data 8 bits at-a-time only
Control bus
There is no real control bus. Instead, the control bus is made up of a number of single bit control signals
operation type in microprocessor
All of the operations of the microprocessor can be classified into one of three types:
Microprocessor Initiated Operations
Internal Operations
Peripheral Initiated Operations
Microprocessor initiated operation
These are operations that the microprocessor itself starts.
These are usually one of 4 operations:
Memory Read
Memory Write
I/O Read (Get data from an input device)
I/O write (Send data to an output device)
It is important to note that the microprocessor treats memory and I/O devices the same way.
Input and output devices simply look like memory locations to the microprocessor.
For example, the keyboard may look like memory address A3F2H. To get what key is being pressed, the microprocessor simply reads the data at location A3F2H.
The communication process between the microprocessor and peripheral devices consist of the following three steps:
Identify the address.
Transfer the binary information.
Provide the right timing signals.
Red operation
To read the contents of a memory location, the following steps take place:
The microprocessor places the 16-bit address of the memory location on the address bus.
The microprocessor activates a control signal called “memory read” which enables the memory chip.
The memory decodes the address and identifies the right location.
The memory places the contents on the data bus.
The microprocessor reads the value of the data bus after a certain amount of time.
internal data operation
The 8085 can perform a number of internal operations. Such as: storing data, Arithmetic & Logic operations, Testing for condition, etc.
To perform these operations, the microprocessor needs an internal architecture similar to the following:
