MATRUSRI ENGINEERING COLLEGE�DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

SUBJECT NAME: 8051MICROCONTROLLERS

FACULTY NAME: Mrs.N.KALPANA

MATRUSRI

ENGINEERING COLLEGE

SYLLABUS

UNIT- I:

Microprocessor Architecture: Microprocessors, Microcomputers, and Assembly Language, Architecture Details and its operation, Bus organization of 8085, Registers, Memory unit of 8085, Instruction decoding & execution, 8085-Based single board Microcomputer, Pin out Diagram of 8085, Bus timings, 8085 Interrupts (Hardware and Software), 8085 Vectored Interrupts. Introduction to Advanced Controllers, ARM, MSP controllers.

UNIT-II:

8085 Programming: The 8085 Programming Model, Operand Types, Instruction Format, Addressing Modes, Instruction set, Writing and debugging simple assembly Language Programs, Delays.

UNIT-III:

Interfacing: Memory and I/O interfacing, Programmable Peripheral Interface 8255 (PPI), Interfacing seven segment display, Interfacing matrix keyboard, A/D and D/A interfacing, Programmable Interval Timer (8253), Programmable Interrupt Controller (8259).

UNIT- IV:

Microcontroller Architecture: Types of Microcontrollers, 8051 Microcontroller – Architecture, Memory organization, special function registers, pins and signals, timing and control, Ports and circuits, Counters and timers, Serial data input / output, Interrupts & timers.

UNIT-V

8051 Programming: The 8051-programming model, Operand Types, Instruction cycle, addressing modes, 8051 instruction set, Classification of instructions. Simple programs and I/O interfacing.

​

MATRUSRI

ENGINEERING COLLEGE

A microcontroller is a small, low-cost and self contained computer-on-a-chip that can be used as an embedded system.

Or

A single chip or CPU with all peripherals like RAM, ROM, I/O, Timers ADC etc on same chip.

CPU

ALU+CU

Data memory

Output

ports

Input

ports

Clock

Microcontroller

Program memory

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

• Central Processor Unit or CPU is the mind of any processing machine.
• It scrutinizes and manages all processes that are carried out in theMicrocontroller.
• User has no power over the functioning of CPU.
• It interprets program printed in storage space (ROM) and carries out all of them and do the projected duty.
• CPU manages different types of registers in 8051 microcontroller.

CPU (Central Processor Unit)

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

• Interrupt is a sub-routine call that reads the Microcontroller’s key function or job.
• It helps it to perform some other program which is extra important at that point of time.
• The characteristic of 8051 Interrupt is extremely constructive as it aids inemergency cases.
• Interrupts provides us a method to postpone or delay the current process.
• It carry out a sub-routine task and then all over again restart standard program implementation.

Interrupts

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

• Micro-controller needs a program which is a set of commands.
• This program enlightens Microcontroller to perform precise tasks.
• These programs need a storage space.
• The memory program of Microcontroller is recognized as Program memory or code memory.
• In common language it’s also known as Read Only Memory or ROM.
• Microcontroller also needs a memory to amass data or operands for the short term.
• The storage space which is employed to momentarily data storage for

functioning.

• It is acknowledged as Data Memory and we employ Random Access Memory or RAM for this principle reason.
• Microcontroller 8051 contains code memory or program memory 4K.
• It has 4KB Rom and it also comprise of data memory (RAM) of 128 bytes.

Memory

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

8051 Microcontroller Memory Organization

Program Memory (ROM)

Data Memory (RAM).

INTERNAL MEMORY

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

01

0

03

04

MATRUSRI

ENGINEERING COLLEGE

Address assigned in hex decimal

128 bytes/Locations means 00-7FH address are assigned.

128Bytes

(00H-7FH)

Data memory/ internal memory