Ministry of higher education and scientific research
Middle Technique University
Department of medical ins. Engineering
3rd stage
Microprocessor (8085)
Assist. Lec Mayss alreem nizar
2021-2022
MSc. Mayss alreem nizar
8085 microprocessor
lec.1
Introduction
1. Define the microprocessor and microcontroller and find
differences between them
• A microprocessor (µP): is a group of electronic circuits fabricated on a
semiconductor chip using either Large Scale Integrated circuit (LSI) or Very
Large Scale Integrated circuit (VLSI) techniques that can read binary
instructions written in a memory and process binary data according to those
instructions. One or more microprocessors typically serve as a central
processing unit (CPU) in a computer system or handheld device. Three basic
characteristics differentiate microprocessors are instruction set, Bandwidth
and Clock speed.
• A microcontroller: A highly integrated chip that contains all the components
comprising a controller. Typically this includes a CPU, RAM, some form of
ROM, I/O ports, and timers. a microcontroller is designed for a very specific
task - to control a particular system.
MSc. Mayss alreem nizar
8085 microprocessor
lec.1
2. Micro processor
• The processing units in the computer are the mastermind, because it is
responsible for processing data externally, The working principle of the
central processing unit is that it receives data from the input devices, processes
it, and then Sending it to the various types of memory used in the computer
for storage, and then sending it to the output units to show results
• The microprocessor is a semiconductor device (Integrated Circuit)
manufactured by the VLSI (Very Large Scale Integration) technique.
• It includes the Arithmetic and Logic Unit, registers and control circuit on a
single chip, to perform a function or useful task. We can connect memory and
other add-ons like keyboard, logic circuit, etc. to the microprocessor. The
microprocessor then commands these devices to act according to the program
or code written in it.
MSc. Mayss alreem nizar
8085 microprocessor
lec.1
• The memories, input device, output device and interfacing devices are called
peripherals. The popular input devices are keyboard and floppy disk and the
output devices are printer, LED/LCD displays, monitor, etc.
3. Advantages of Microprocessor based system
Computational/Processing speed is high.
Intelligence has been brought to systems.
Automation of industrial processes.
Since the devices are programmable, there is flexibility to alter the system by
changing the software alone.
5. Less number of components, compact in size and cost less. Also it is more
reliable.
6. Operation and maintenance are easy.
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4. Application of microprocessor
1. Instrumentation: It has very wide applications in the field of instrumentation
in systems like in control panel of press printing machine, security systems
etc. It is also used in medical instruments like ECG (electronic cardiogram)
etc making the device smart.
2. Entertainment: Microprocessors are also used in various gaming consoles,
DVD player, etc.
3. Communication : Microprocessors are being used in a wide range of
communication equipment’s like: in digital telephone sets, in television,
satellite communication, etc
4. Temperature controller
5. Home
5. Features of 8085
1. It is an 8 bit microprocessor (each character is represented by 8 bits or a
byte).
MSc. Mayss alreem nizar
8085 microprocessor
lec.1
2. It is manufactured with N-MOS (n-type Metal Oxide Semiconductor)
technology implemented with 6200 transistors.
3. It works on , +5 volts supply
4. It has an execution speed 3, 5, and 6 MHz
5. It has 8 bit Data bus , in other words, it has 8 bit word length
6. It has 16-bit address lines - A0-A15 (to point the memory locations) and
hence can point up to 2^16 = 65535 bytes (64KB) memory locations.
7. It consists of 74 instruction sets.
8. It performs arithmetic and logical operations.
9. It is enclosed with 40 pins DIP (Dual in line package).
6. 8085 architecture
MSc. Mayss alreem nizar
8085 microprocessor
lec.1