Basic of microprocessor
The complete CPU circuit which is
fabricated on single IC chip is called microprocessor
microprocessor contains the ALU,
Control unit and number of register for different purpose
Externally it has number of pins as
data bus, control bus, address bus, and some other communication signal. A
microprocessor is programmable device which can perform a number of arithmetic
and logic operation. It requires input devices and output devices and memory.
Features of 8085 processor
1. It is 40 pins IC in the
form of dual in line package(DIP)
2. It requires +5v DC power
supply with respect to ground
3. It is an 8bit
microprocessor that mean it receives 8bit data, 8bit instruction and generate
8bit result
4. Its internal register is
also 8bit wide and its ALU and Accumulator are also 8bit size
5. It generates 16bit address
for memory so, it is able to access
216 =64KB of memory
6. It operates at clock
frequency of 3MHZ
7. its instruction set
contains 78 different instructions of these instruction.
8. It can transmit and
receives data both in serial as well as parallel formats.
9. It supports both hardware
as well as software interrupt operations there are five interrupts available in
pins and there are 8 software interrupts available as instructions
10.
Its data bus Address bus are multiplex that mean some set of 8bit
carry the address as well as data on time shearing bases
11.
The internal circuitry of 8085 uses 6500 switching transistor of MOS
technology
12.
It was launched in the year of 1976 by intel corporation of US
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