This set of microprocessor multiple choice questions. Lecture note on microprocessor and microcontroller theory. Tutorial on introduction to 8085 architecture and programming. Now here we see how we can classified 8255 ppi ic depending upon its operational modes. Basic concepts of microprocessors differences between. Microprocessor 8085 8086 download ebook pdf, epub, tuebl, mobi. Microprocessors 9 architecture of risc risc microprocessor architecture uses highlyoptimized set of instructions. Microprocessor 8086 architecture programming and interfacing. Bit set reset bsr mode this mode is used to set or reset the bits of port c only, and selected when the most significant bit d7 in the control register is 0. The 8bit, 3state bidirectional buffer is used to interface the 8255 internal data bus with the external system data bus. The 8255 has 24 io pins divided into 3 groups of 8 pins each. Click download or read online button to get microprocessor 8086 architecture programming and interfacing book now. Reset out signal from 8085 is connected to the reset signal of the 8255. The i8255 was also used with the intel 8085 and intel 8086 and their descendants and found wide applicability in digital.
Microprocessors and interfacing 8086, 8051, 8096, and. The control words or status information is also transferred through the buffer. The device that enables the microprocessor to read data from the external devices is a printer b joystick c display d reader answer. Question bank 2 download pdf microprocessors and microcontrollers question bank download pdf ec8691, ec6504 microprocessors and microcontrollers important questions download pdf. Hardware architecture of 8085 microprocessor pin diagram of 8085 microprocessor. This is not micro processor but an addon chip to microprocessor block. Here we come with a new topic operational modes of 8255 ppi ic. What is 8255 programmable peripheral interface ppi. Every one of the ports can be configured as either an input port or an output port. The intel 8255a is a general purpose programmable io device which is designed for use with all intel and most other microprocessors. There are 24 io pins of the 82c55a make it compatible with the 3.
This tristate bidirectional buffer is used to interface the internal data lilts of 8255 to the system data bus. Microprocessors and microcontrollers ee8551, ec8691. It is used in portable devices like apple ipod due to its power efficiency. Microprocessor 8255 programmable peripheral interface. The lcds rw pin is connected to pb1 of port b of the 8255. Assembler directives, simple programs, procedures, and macros. The microprocessor is one of most known subject is computer engineering branch. Adc interfacing with 8085 ppi 8255 8155 intel microprocessor block diagram. Pin diagram of 8255a the pin configuration of 8255 is shown in fig. This tristate bidirectional buffer is used to interface the internal data bus of 8255 pin diagram to the system data bus. An over view of 8085, architecture of 8086 microprocessor.
We will use absolute decoding scheme that uses all the 16 address lines. The 8255 is to be interfared with lower order data bus. The lcds e pin is connected to pb2 of port b of the 8255. Addressing modes, instruction set, and programming of 8086 80 5. Microprocessor and microcontroller notes pdf mpmc pdf notes. The intel 8255a is a general purpose programmable io. Aug 05, 2019 8255 ppi chip architecture pdf input device with the output device or viceversa. Microprocessor and interfacing pdf notes mpi notes pdf. Here you can download the free lecture notes of microprocessor and microcontroller pdf notes mpmc notes pdf materials with multiple file links to download microprocessor and microcontroller notes pdf mpmc pdf notes book starts with the topics instruction formats, addressing modes, instruction set, assembler directives,macros,overview of 8051 microcontroller,architecture, io. This buffer receives or transmits data upon the execution of input or output instructions by the. The intel 8255 or i8255 programmable peripheral interface ppi chip was developed and manufactured by intel in the first half of the 1970s for the intel 8080 microprocessor. Part, manufacturer, description, pdf, samples, ordering.
The 8255 is a member of the mcs85 family of chips, designed by intel for use with their 8085 and 8086 microprocessors and. Apr 17, 2018 8255 programmable peripheral interface video lecture of study and interfacing of peripherals with 8085 in chapter from microprocessor subject for electronics engineering students. It consists of three 8bit bidirectional io ports i. The address and data bus are multiplexed in this processor which helps in providing more control signals. Data is transmitted or received by the buffer as per the instructions by the cpu. We can program it according to the given condition. In my previous post i discussed on details of programmable peripheral interface ppi ic 8255. Characteristics of risc the major characteristics of a risc processor are as follows. Now let us discuss the functional description of the pins in 8255a. Operational modes of 8255 ppi ic electronics engineering. The ebook has complete chapters on microprocessor and it is. Here you can download the free lecture notes of microprocessor and microcontroller pdf notes mpmc notes pdf materials with multiple file links to download microprocessor and microcontroller notes pdf mpmc pdf notes book starts with the topics instruction formats, addressing modes, instruction set, assembler directives,macros,overview of 8051 microcontroller,architecture, io ports. Interfacing 8255 with 8086 microprocessor interfacing. Click download or read online button to get microprocessor 8085 8086 book now.
Control words and status information is also transferred using this bus. There are 24 io pins which may be individually programmed in 2 groups. Microprocessor and microcontroller pdf notes mpmc notes. Aug 21, 2018 interfacing 8255 with 8086 microprocessor. It provides 24 io pins which may be individually programmed in 2. A0 and reset are the inputs, provided by the microprocessor to readwrite control logic of 8255.
Before knowing about the 8085 architecture in detail, lets us briefly discuss about the basic features of 8085 processor 8085 microprocessor is an 8bit microprocessor with a 40 pin dual in line package. The lcds rs pin is connected to pb0 of port b of the 8255. Microprocessor and microcontroller pdf notes mpmc notes pdf. Interfacing 8255 with 8086 microprocessor interfacing 8255.
The 8255 provides 24 parallel inputoutput lines with a variety of programmable operating modes. In the io mode, the 8255 ports work as a reset pins b set pins c programmable io ports d only output ports. The 8255 is a member of the mcs85 family of chips, designed by intel. Programmable peripheral interface ppi 8255 8255 is a general purpose programmable device used for data transfer between processor and io devices. Pdf microprocessor and microcontroller pdf notes mpmc.
Since joystick is an input device, it reads data from the external devices. Jul 09, 2017 8255 is an intel io expander for 80858051 and other micro processorscontrollers. Microcomputer a computer with a microprocessor as its cpu. Datasheet the 82c55a is a high performance cmos version of the industry standard 8255a and is manufactured using a selfaligned silicon gate cmos process scaled saji iv. The 8255 can be connected in a microcomputer system as either memorymapped io or iomapped io. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as adc, dac, keyboard etc. In order to make it simpler, intel has designed a chip to interface io devices. Microprocessor 8085 8086 download ebook pdf, epub, tuebl. Nitin ahire 9 introduction to 8085introduction to 8085 cpu built into a single semiconductor chip is called as microprocessor the microprocessor work as a brain of a computer it consist of alu, registers and control unit the microprocessor are usually characterized by speed, word length bit, architecture. This is economical, functional, flexible but is a little complex and general purpose io device that can be used with almost any microprocessor. After converting the data into parallel form, it transmits it to the cpu. This mode affects only one bit of port c at a time because, as user set the bit, it remains set until.
Generalpurpose microprocessor used in general computer system and can be used by programmer for any application. Here rd and wr signals are activated when iom signal is high, indicating io bus cycle. It consists of data bus buffer, control logic and group a and group b controls. The lcds data pins are connected to port a of the 8255. It can be used to transfer data under various condition from simple inputoutput to interrupt inputoutput. Programmable peripheral interface 8255 geeksforgeeks. Learning objectives on completion of this lesson you will be able to. Interface an 8255 chip with 8086 to work as an io port. The a0 and a1 pins of 8255 are connected to a1 and a2 pins of the microprocessor respectively. The groups are denoted by port a, port b and port c respectively. It is a general purpose programmable io device which may be used with many different microprocessors. Interface ppi 8255 8255 is a general purpose programmable device used for data transfer between processor and io devices. Ppi 8255 interface with 8085 datasheet, cross reference, circuit and application notes in pdf format.