Block Diagram Of 8255 Programmable Peripheral Interface

The pin diagram of 8255 is shown in fig.

Block diagram of 8255 programmable peripheral interface. Draw the block diagram of 8255. In this video lecture i explained introduction of 8255 programmable peripheral interface ppi. Wr cs 6 35. Suresh bojja department of ece 8255 ppi programmable peripheral interface open box education.

Programmable peripheral interface 8255 basics control signals block diagram control word modes duration. Block diagram and pin diagram of 8255. The 8255 has 24 io pins divided into 3 groups of 8 pins each. Engineering funda 42848 views.

Intel introduced this programmable peripheral interface ppi chip 8255a for interfacing peripheral devices to the 8085 system. 8255 pin diagram a. Port c is further divided into two 4 bit ports ie. This versatile chip 8255a is used as a general purpose peripheral device for parallel data transfer between microprocessor and a peripheral device by interfacing the device to the system data bus.

Draw the pin diagram of ppi 8255. Reset gnd 7 34. 8255 programmable peripheral interface video lecture of study and interfacing of peripherals with 8085 in chapter from microprocessor subject for electronics engineering students. When the signal is low the microprocessor reads the data from the selected io port of the 8255.

It can be programmable to transfer data under various conditions from simple io to interrupt io. It is part 1 of 8255 ppi here i discussed introduction of 8255 ports of 8255 operating mode of 8255. Port c lower and port c upper and port c can work in either bsr bit set rest mode or in mode 0 of input output mode of 8255. Programmable interval timer 8253.

8255 programmable peripheral interface ppi the intel 8255 or i8255 programmable peripheralinterface ppi chip is a peripheral chip is used to give the cpu access to programmable parallel io. 1 8 33 d 1 source. The groups are denoted by port a port b and port c respectively. A 0 and a 1 these input signals work with rd wr and one of the control signal.