What is the name of 8255 IC?
Programmable Peripheral Interface (PPI)
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. The 8255 provides 24 parallel input/output lines with a variety of programmable operating modes.
Why is 8255 ppi used as an interfacing device?
PPI 8255 is a general purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard etc. We can program it according to the given condition. It can be used with almost any microprocessor. It consists of three 8-bit bidirectional I/O ports i.e. PORT A, PORT B and PORT C.
Which IC used in PPI interfacing?
DETAILS OF PPI IC 8255A Answer is by using Programmable Peripheral Interface (8255). Programmable Peripheral Interface (PPI) IC 8255 is provide I/O ports to 8085 microprocessor to connect I/O devices. The input/output devices are generally connect with the microprocessor through the input/output port.
What is status word in 8255?
This is often called Program Controlled I/O. The status word is accessed by reading Port C (A 1 A 0 must be 10, RD and CS must be low).. The status word format when Ports A and B are input ports in Mode 1, is shown in Fig. 14.10.
Why do we need interfacing?
Interfacing is one of the important concepts in microcontroller 8051 because the microcontroller is a CPU that can perform some operation on a data and gives the output. However to perform the operation we need an input device to enter the data and in turn output device displays the results of the operation.
Why is 8255 PPI used as an interfacing device?
Where is control register in 8255?
The control word format of the 8255 is shown in Fig. below. The contents of the control register are called the control word that specifies the input/ output functions of each port. The control word register can be accessed to write the control word by selecting AD_1 and AD_0 in high condition i.e. both ON.
What is 8255 PPI IBM PC interface card?
The 8255 PPI IBM PC Interface Card (Programmable Peripheral Interface) plugs into any available 8 or 16-bit slot (AT-slot) on PC’s motherboard. Such a card allows you to do both digital input and output to your PC. The 8255A card is programmable by the sysstem software.
What is Intel 8255 used for?
Intel 8255 is a peripheral interface (PPI) chip which is programmable. It is used for the connection of peripheral devices and interfacing. We call Peripheral device also as Input Output device.
What is microcontroller 8086 8255 used for?
Microcontroller Microprocessor 8086 8255 Intel 8255 is a peripheral interface (PPI) chip which is programmable. It is used for the connection of peripheral devices and interfacing. We call Peripheral device also as Input Output device.
What are the modes of 8255 interface?
Modes of 8255 – It works in two modes: To know in which mode the interface is working we need to know the value of Control word. Control word is a part of control register in 8255 which specify an I/O function for each port. This is format of control word 8255.