In this chapter, we will discuss Memory Interfacing and IO Interfacing with 8085. Interface is the path for communication between two components. Interfacing is of two types, memory interfacing and I/O interfacing. When we are executing any instruction, we need the microprocessor to access the. I/O Interfacing − Overview. Microprocessors 6 Microprocessor is a controlling unit of a micro-computer, fabricated on a small chip capable of performing ALU (Arithmetic Logical Unit) operations and communicating with the other devices connected to it.
- Microprocessor Tutorial
- 8085 Microprocessor
- 8086 Microprocessor
- Multiprocessor Configuration
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In this chapter, we will discuss Memory Interfacing and IO Interfacing with 8085.
Interface is the path for communication between two components. Interfacing is of two types, memory interfacing and I/O interfacing.
Memory Interfacing
When we are executing any instruction, we need the microprocessor to access the memory for reading instruction codes and the data stored in the memory. For this, both the memory and the microprocessor requires some signals to read from and write to registers.
The interfacing process includes some key factors to match with the memory requirements and microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor.
IO Interfacing
There are various communication devices like the keyboard, mouse, printer, etc. So, we need to interface the keyboard and other devices with the microprocessor by using latches and buffers. This type of interfacing is known as I/O interfacing.
Block Diagram of Memory and I/O Interfacing
8085 Interfacing Pins
Following is the list of 8085 pins used for interfacing with other devices −
- A15 - A8 (Higher Address Bus)
- AD7 - AD0(Lower Address/Data Bus)
- ALE
- RD
- WR
- READY
Ways of Communication − Microprocessor with the Outside World?
There are two ways of communication in which the microprocessor can connect with the outside world.
- Serial Communication Interface
- Parallel Communication interface
Serial Communication Interface − In this type of communication, the interface gets a single byte of data from the microprocessor and sends it bit by bit to the other system serially and vice-a-versa.
Parallel Communication Interface − In this type of communication, the interface gets a byte of data from the microprocessor and sends it bit by bit to the other systems in simultaneous (or) parallel fashion and vice-a-versa.
Here you can download the free lecture Notes of Microprocessor and Interfacing Pdf Notes – MPI Notes Pdf materials with multiple file links to download. Microprocessor and Interfacing Notes Pdf – MPI Pdf Notes book starts with the topics Vector interrupt table, Timing diagram, Interrupt structure of 8086. Vector interrupt table.
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Microprocessor and Interfacing Notes pdf – MPI pdf notes – MPI notes pdf file to download are listed below please check it –
Microprocessor and Interfacing Notes Book
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Note :- These notes are according to the R09 Syllabus book of JNTU.In R13 and R15,8-units of R09 syllabus are combined into 5-units in R13 and R15 syllabus. If you have any doubts please refer to the JNTU Syllabus Book.
Microprocessor and Interfacing Notes Pdf – MPI Pdf Notes
UNIT-I
An over view of 8085, Architecture of 8086 Microprocessor. Special functions of General purpose registers. 8086 flag register and function of 8086 Flags. Addressing modes of 8086. Instruction set of 8086. Assembler directives, simple programs, procedures, and macros.
UNIT-II
Assembly language programs involving logical, Branch & Call instructions, sorting, evaluation of arithmetic expressions, string manipulation.
UNIT-III
Pin diagram of 8086-Minimum mode and maximum mode of operation. Timing diagram. Memory interfacing to 8086 (Static RAM & EPROM). Need for DMA. DMA data transfer Method and Interfacing with 8237/8257.
UNIT-IV
8255 PPI – various modes of operation and interfacing to 8086. Interfacing Keyboard and Displays, 8279 Stepper Motor and actuators. D/A and A/D converter interfacing.
Microprocessor and Interfacing Notes pdf Details
UNIT-V
Interrupt structure of 8086. Vector interrupt table. Interrupt service routines. Introduction to DOS and BIOS interrupts. 8259 PIC Architecture and interfacing cascading of interrupt controller and its importance.
UNIT-VI
Serial data transfer schemes. Asynchronous and Synchronous data transfer schemes. 8251 USART architecture and interfacing. TTL to RS 232C and RS232C to TTL conversion. Sample program of serial data transfer.IEEE 488 GPIB.
UNIT-VII
Overview of 8051 microcontroller, Architecture, I/O ports and memory organisation, addressing modes and instruction set of 8051, simple programs
UNIT-VIII
Timer/ Counter operation in 8051, serial communication control in 8051 and interrupt structure of 8051, memory and I/O interfacing of 8051.
Reference – Microprocessor and Interfacing Notes – MI notes pdf – MI pdf notes – MI Pdf – MI Notes
1. Micro Processors & Interfacing – Douglas U. Hall, 2007.
2. The 8088 and 8086 Micro Processors – PHI, 4th Edition, 2003.
3. Micro Computer System 8086/8088 Family Architecture, Programming and Design – By Liu and GA Gibson, PHI, 2nd Ed.,
Text books – Microprocessor and Interfacing Notes – MI notes pdf – MI pdf notes – MI Pdf – MI Notes
1. Advanced microprocessor and Peripherals – A.K.Ray and K.M.Bhurchandi, TMH, 2000.
2. Micro Controllers –Ajay V.Deshmukh, Tata McGraw Hill Edition.
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