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EE8551
MICROPROCESSORS
AND
MICROCONTROLLERS
Dr.P.NARASIMMAN
AP/EEE
Kings College of Engineering

UNIT I 8085 PROCESSOR
Hardware Architecture, pinouts — Functional Building
Blocks of Processor — Memory organization — I/O ports
and data transfer concepts– Timing Diagram —
Interrupts.
UNIT II PROGRAMMING OF 8085 PROCESSOR
Instruction -format and addressing modes — Assembly
language format — Data transfer, data
manipulation& control instructions — Programming:
Loop structure with counting & Indexing —
Look up tability — Subroutine instructions — stack.

UNIT III 8051 MICRO CONTROLLER
Hardware Architecture, pin outs — Functional Building Blocks of
Processor — Memory organization — I/O ports and data transfer
concepts– Timing Diagram — Interrupts- Data Transfer,
Manipulation, Control Algorithms& I/O instructions, Comparison
to Programming concepts with 8085.
UNIT IV PERIPHERAL INTERFACING
Study on need, Architecture, configuration and interfacing, with
ICs: 8255, 8259, 8254, 8279, — A/D and D/A converters
&Interfacing with 8085& 8051.
UNIT V MICRO CONTROLLER PROGRAMMING &
APPLICATIONS
Simple programming exercises- key board and display interface –
Control of servo motor stepper motor control- Application to
automation systems.

UNIT I
8085 PROCESSOR
Hardware Architecture, pinouts - Functional
Building Blocks of Processor - Memory
organization - I/O ports and data transfer
concepts– Timing Diagram - Interrupts.

INTRODUCTION
Bit: A bit is a single binary digit.
Word: A word refers to the basic data size or bit size that can be
processed by the arithmetic and logic unit of the processor. A 16-
bit binary number is called a word in a 16-bit processor.
Memory Word: The number of bits that can be stored in a register
or memory element is called a memory word.
Bus: A bus is a group of wires (lines) that carry similar
information.
System Bus: A system bus is a group of wires used for
communication between the microprocessor and peripherals.

Address Bus: It carries the address, which is a
unique binary pattern used to identify a memory
location or an I/O port.
Data Bus: The data bus is used to transfer data
between memory and processor or between I/O
device and processor.
Control Bus: The control bus carries control
signals, which consist of signals for selection of
memory or I/O device from the given address,
direction of data transfer, and synchronization of
data transfer in case of slow devices.

What is 8085 Microprocessor?
 It has 8 bit data bus and 16 bit address bus, thus it
is capable of addressing 64 KB of memory.
 It has 8 bit ALU 8 bit ALU that can perform 8 bit
operations.
 Lower order address bus is multiplexed with data bus
to minimize the chip size.
 The 8085 microprocessor is an 8-bit processor
available as a 40-pin IC package (shown the figure
below) and uses +5 V for power. It can run at a
maximum frequency of 3 MHz.

Internal Architecture of 8085
Microprocessor

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Unit-I.pptx

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