Programmable Peripheral Interface 8255
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The document discusses the Programmable Peripheral Interface 8255 (PPI), which is an I/O port chip used for interfacing I/O devices with microprocessors. It has 24 pins for I/O that are programmable in groups of 12 pins and has three distinct modes of operation. The PPI is commonly used in microprocessor labs for interfacing experiments and knowledge of it is essential for students. It describes the basic modes of operation and how to program the 8255.
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The 8255A Programmable Peripheral Interface chip has two main modes of operation - I/O mode and Bit Set-Reset mode. In I/O mode, the ports work as programmable I/O ports and can be configured in three sub-modes (Mode 0, 1, and 2) using a Control Word Register. Mode 1 uses handshaking signals to coordinate data transfer between ports. Mode 2 allows bi-directional communication on a single bus. In Bit Set-Reset mode, individual bits of port C can be set or reset using the Control Word Register.
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INTRODUCTION
We know that a microprocessor is the CPU of a computer. A microprocessor can perform some operation on a data and give the output. But to perform the operation we need an input to enter the data and an output to display the results of the operation. So we are using a keyboard and monitor as Input and output along with the processor. Microprocessors engineering involves a lot of other concepts and we also interface memory elements like ROM, EPROM to access the memory.
Types of Interfacing
There are two types of interfacing in context of the 8085 processor.
Memory Interfacing.
I/O Interfacing.
Memory Interfacing:
While executing an instruction, there is a necessity for the microprocessor to access memory frequently for reading various instruction codes and data stored in the memory. The interfacing circuit aids in accessing the memory.
Memory requires some signals to read from and write to registers. Similarly the microprocessor transmits some signals for reading or writing a data.
But what is the purpose of interfacing circuit here?
The interfacing process involves matching the memory requirements with the 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. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
The interfacing process involves matching the memory requirements with the 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. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
I/O Interfacing:
We know that keyboard and Displays are used as communication channel with outside world. So it is necessary that we interface keyboard and displays with the microprocessor. This is called I/O interfacing. In this type of interfacing we use latches and buffers for interfacing the keyboards and displays with the microprocessor.
But the main disadvantage with this interfacing is that the microprocessor can perform only one function. It functions as an input device if it is connected to buffer and as an output device if it is connected to latch. Thus the capability is very limited in this type of interfacing.
With suitable diagram explain the working of 8255 a and inerrupts
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AN UNDEFINED FUNCTION AT THE TIME OF MANUFACTURE. IT PERMITS
ELABORATE DIGITAL LOGIC DESIGNS TO BE IMPLEMENTED BY THE USER ON
A SINGLE DEVICE. THE INTERNAL LOGIC GATES AND/OR CONNECTIONS OF
PLDS CAN BE CHANGED/CONFIGURED BY A PROGRAMMING PROCESS.
Use of plc in industrial automation
The document discusses the history and use of programmable logic controllers (PLCs) in industrial automation. It notes that PLCs were first specified in 1968 by General Motors to provide a solid-state, reusable system for controlling industrial processes more flexibly than relay-based systems. A PLC consists of a central processing unit, power supply, programming unit, memory, and input/output interfacing circuitry. It scans inputs, executes user-programmed logic instructions, and updates outputs on a continuous cycle. Common programming methods for PLCs include ladder logic, functional block diagrams, and structured text. PLCs communicate with field devices and one another using various interfaces and protocols.
A microprocessor is the main component of a microcomputer system and is also ...
The document describes the curriculum for a course on microprocessors and their applications. It contains 5 modules: 1) Introduction, 2) 8085 pins, 3) 8085 architecture and programming, 4) interfacing techniques, and 5) other 8-bit microprocessors. Module 1 introduces basic microcomputer concepts like CPU, memory, I/O, hardware, and software. Module 2 describes the various pin categories and functions of the 8085 microprocessor. Module 3 discusses the 8085 architecture including registers, ALU, programming, and instruction set. Module 4 covers interfacing memories and I/O devices to the 8085. Module 5 provides an introduction to other 8-bit microprocessors like the Z80 and MC6800
VLSI PLDS pla, pal
This document discusses different types of programmable logic devices (PLDs), including simple PLDs (SPLDs), complex PLDs (CPLDs), and field programmable gate arrays (FPGAs). SPLDs can replace simple logic functions, while CPLDs can replace more complex functions equivalent to 2-64 SPLDs. FPGAs have the largest capacity and consist of configurable logic blocks and programmable interconnects. PLDs offer advantages over fixed logic devices like lower costs, faster design changes, and easier troubleshooting. The document provides examples and diagrams of PLD components like PALs, PLAs, and FPGA architectures.
Programming logic controllers (plc)
This document provides an overview of programmable logic controllers (PLCs). It discusses the history of PLCs, the need for them to replace hardwired control panels, and defines a PLC as a specialized computer used for industrial machine and process control. The key components of a PLC are described as the processor, memory, power supply, I/O modules, and programming device. Advantages include less wiring, increased reliability, and flexibility, while disadvantages include proprietary architectures. PLCs are widely used to control industrial applications and machinery.
Industrial Computer Application, CH-1
This document provides an introduction to programmable logic controllers (PLCs). It defines a PLC as an industrial grade computer that can be programmed to perform control functions. The document discusses how PLCs are used in applications like car factories. It also outlines key characteristics of PLCs like their real-time processing capabilities. Examples of PLC components like the central processing unit, input/output modules, and programming devices are provided. Benefits of PLCs such as fast response, easy programming and flexibility are highlighted.
Unit 4
The document discusses the architecture of the 8051 microcontroller. It describes the 8051's central processing unit, memory organization, input/output ports, timers/counters, serial port, and interrupts. The 8051 has a CPU, RAM, ROM, and I/O ports integrated into a single chip. It can be programmed to perform control and sensing tasks in embedded systems.
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Programmable Peripheral Interface 8255
- 1. 1 PROGRAMMABLE PERIPHERAL INTERFACE - 8255 Department of Mechanical Engineering DHIRAJLAL GANDHI COLLEGE OF TECHNOLOGY Name of Faculty : Dr.P.Parandaman Designation : Associate Professor Department : Mechanical Engineering Year/Semester : IV /VII
- 3. Intel 8255 PPI PPI – Programmable Peripheral Interface It is an I/O port chip used for interfacing I/O devices with microprocessor Very commonly used peripheral chip Knowledge of 8255 essential for students in the Microprocessors lab for Interfacing experiments 3
- 4. About 82C55 • The 82C55 is a popular interfacing component, that can interface any TTL-compatible I/O device to a microprocessor. • It is used to interface to the keyboard and a parallel printer port in PCs (usually as part of an integrated chipset). • Requires insertion of wait states if used with a microprocessor using higher that an 8 MHz clock. • PPI has 24 pins for I/O that are programmable in groups of 12 pins and has three distinct modes of operation.
- 5. 8255 : Pin Layout
- 12. Basic Mode Definitions and Bus Int • Mode 0 – Basic I/O • Mode 1 – Strobe I/O • Mode 2 – Bi-Dir Bus
- 13. 11-13 Programming 8255 8255 has three operation modes: mode 0, mode 1, and mode 2
- 47. 47 Department of Mechanical Engineering