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1. The 8051
Microcontroller
PRESENTED BY
AVINASH KUMAR
IOT(2nd YEAR)
Dayalbagh Educational Institute

2. Overview
 Introduction.
 Important Features of 8051
 Microprocessor Vs Microcontroller
 Types Of Architectures
 Architecture
 Pin diagram
 Application Of 8051

3. INTRODUCTION
• A MICROCONTROLLER IS A SINGLE CHIP MICROPROCESSOR SYSTEM WHICH
CONSISTS OF CPU,DATA AND PROGRAM MEMORY, SERIAL AND PARALLEL I/O
PORTS, TIMERS AND EXTERNAL AS WELL AS INTERNAL INTERRUPTS.
• IT CAN ALSO BE CALLED AS A ENTIRE COMPUTER MANUFACTURED ON A
SINGLE CHIP.

4. Important Features of 8051
 4K bytes ROM
 128 bytes RAM
 Four 8-bit I/O ports
 Two 16-bit timers
 Serial interface
 64K external code memory space
 64K data memory space

5. Features
Microcontroller 8051 was first developed by
INTEL, for use in embedded systems.
it consisted of standard on chip peripherals
i.e.
timers, counters, 4k bytes of on chip program
memory and 128 bytes of data memory.
It has separate spaces for program memory and
data memory.
It has 128 byte of data memory that are
accessible directly by its instructions

6. Microprocessor vs Microcontroller
Microprocessor
• General purpose device.
• do not contain on-chip
I/O ports, Timers, ADC
Memory etc.
• used as CPU in computer.
• design is complex and
expensive.
• it has zero status flag.
Microcontroller
• single chip computer.
• it includes RAM ,ROM
,Timers, ADC, DAC,
interrupts etc.
• performs control oriented
applications.
• simple and less expensive
• it has no zero flag.

7. TYPES OF ARCHITECTURES
1)Von-Neumann Architecture
• only one bus.
• used for both data transfer and instruction fetches.
• cannot be performed at same time
2) Harvard Architecture
• Separate data and instruction buses.
• Transfers to be performed simultaneously on both buses.

8. ARCHITECTURE

9. Pin Description
of the 8051
The 8051 is a 40 pin
device, but out of
these 40 pins, 32 are
used for I/O.
24 of these are dual
purpose, i.e. they can
operate as I/O or a
control line or as part
of address or date
bus.

10. APPLICATION OF 8051
• Automobile.
• Rail Transport.
• Industrial Processing.
• Remote sensing.
• Robotics.
• Consumer electronics.
• Security(e-commerce and smart cards).
• Medical.
• Defense application