A datasheet pdf programmable peripheral interface intel. Ppi the programmable peripheral interface inputoutput. A, b, c function as 8 bit io ports c can be divided into two 4 bit io ports. Buy ic 8255ac5 programmable peripheral interface 40pin dip. It provides 24 io pins can be individually programmed in 2 groups of 12 used in 3 major modes of operation. Singlebit, 4bit, and bytewide input and output ports level sensitive inputs latched outputs strobed inputs or outputs strobed bidirectional input. This is economical, functional, flexible but is a little complex and general purpose io device that can be used with almost any microprocessor. It is also called as programmable peripheral inputoutput port. Its function is that of a general purposes io component to interface peripheral equipment to the microcomputer system bush. It is a general purpose programmable io device which may be used with. How many ports are there in 8255 and what are they. The 8255a is a general purpose programmable io device designed for use with intel microprocessors. Now let us discuss the functional description of the pins in 8255a. Registers this section describes the following a8255 registers.
Chmos programmable peripheral interface, 82c55a datasheet, 82c55a circuit, 82c55a data sheet. The functional configuration of the 82c55a is programmed by the system. Improved dc driving capability pin diagram function of pins. View notes 8255gpio from cpe 301 at university of nevada, reno. The 8255 is a member of the mcs85 family of chips, designed by intel for use with their 8085 and 8086 microprocessors and. It has 24 io programmable pins like pa,pb,pc 38 pins. Jameco will remove tariff surcharges for online orders on instock items learn more. Construction and application of a computer based interface. Ppi makes an interrelation between microprocessor and slower peripheral devices.
Mode 0 is the basic inputoutput mode that allows the pins of group b to be. Cmos programmable peripheral interface datasheet the intersil 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. It is used to interface to the keyboard and a parallel printer port in pcs usually as part of an integrated chipset. The 82c55a is a high performance cmos version of the industry standard 8255a. Intel 82c55a programmable peripheral interface single chip, general purpose io module designed for use with the intel 80386 can control a variety of simple peripheral devices. It can be used to transfer data under various condition from simple inputoutput to interrupt inputoutput. Peripheral interface 82c55a ttl compatible application on keyboards, speakers and printers three i o ports the programmable peripheral interface. The 8255 provides 24 parallel inputoutput lines with a variety of programmable operating modes. Use of 8255 programmable peripheral interface physics forums. Programmable peripheral interface ppi 8255 8255 is a general purpose programmable device used for data transfer between processor and io devices. Bit d7 is used for specifying whether word loaded in to bit set. Cmos programmable peripheral interface the intersil 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.
Data is transmitted or received by the buffer as per the instructions by the cpu. Description the intel 82c55a is a general purpose programmable io device which may be used with many different microprocessors. Programmable peripheral interface 8255 linkedin slideshare. Programmable peripheral interface 8255 ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as adc, dac, keyboard etc. Lecture materials on 8255 programmable peripheral interface prepared by mohammed abdul kader, lecturer, eee, iiuc if bit 7 of the control word is a logical 1 then the 8255 will be.
It is a general purpose programmable io device which may be used with many different microprocessors. Programmable peripheral interface 8255 geeksforgeeks. Then why do we use 8255 programmable peripheral interface to interface io devices with 8085 as it only has 3 ports you can have a lot more than 256 ports if you want to memory map them, but yes the 8085 processor has a separate 256 port 8 bit io address space. We can program it according to the given condition. Customers can work off the large industry knowledge surrounding the intel 8255a 82c55a and harris intersil 82c55a devices to get microprocessor system designs with programmable io requirements up and running quickly. October 1995order number 23125600482c55achmos programmable peripheral interfaceycompatible with all intel and mostother microprocessorsyhigh speed zero wait stateoperation with 8 mhz 808688 and datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. The 8255a is a programmable peripheral interface ppi device designed for use in intel microcomputer systems. The 82c55 is a popular interfacing component, that can interface any ttl compatible io device to a microprocessor. The mode format for io as shown in figure the control word for both mode is same. It consists of three 8bit bidirectional io ports 24io lines that can be configured to meet different system io needs.
The s outputs are latched to hold the last data written to them. There are 24 io pins which may be individually programmed in 2 groups of 12 and used in 3 major modes of. Intel, alldatasheet, datasheet, datasheet search site for electronic. The is a member of the mcs family of chips, designed by intel for use with their and microprocessors and their descendants lntel. The process of establishing inter relation between slower peripheral device and. The 8255 has 24 io pins divided into 3 groups of 8 pins each. Ppi 8255 is a general purpose programmable io device designed to interface the cpu with its outside world such as. Ic 8255ac5 programmable peripheral interface 40pin dip. The 8255a is a general purpose programmable io device designed to transfer the data from io to interrupt io under certain conditions as required. The db8255a programmable peripheral interface is a siliconproven 24 line programmable io interface ip core. It is a tristate 8bit buffer, which is used to interface the microprocessor to the system data bus. These are 8bit bidirectional buses, connected to 8085 data bus for transferring data. Every one of the ports can be configured as either an input port or an output port. Programmable peripheral interface the 8255a is a general purpose programmable io device designed for use with intel microprocessors.
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. Radiation hardened cmos programmable peripheral interface. Intel chmos programmable peripheral interface,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Requires insertion of wait states if used with a microprocessor using higher that an 8 mhz clock. Its function is that of a general purpose io component to interface peripheral equipment to the microcomputer system bus. Interface card the interface card is based on intels 8255a programmable peripheral interface ppi ic. The mx82c55a has identical features as the x82c55 with the exception of no bus hold devices on the port pins. Microprocessor 8255 programmable peripheral interface. Programmable peripheral interface 8255 shri shivaji college. The 8255a contains three 8bit ports providing 24 lines of digital io. I np utoutput i nterface circuits and lsi peripheral devices. The groups are denoted by port a, port b and port c respectively.