input device with the output device or vice-versa. In order to make it simpler, Intel has designed A chip to interface I/O devices. The Intel A is a general. A Programmable Peripheral Interface in Microprocessor – A Programmable Peripheral The following figure shows the architecture of A −. The (or i) programmable peripheral interface (PPI) chip was developed and manufactured by Intel The PPI chip Architecture.

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8255 Programmable Peripheral Interface

A “low” on this input pin enables to send the data or status information to the CPU on the data bus. They are normally connected to the least significant bits of the address bus A0 and A1. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Study The impact of Demonetization across sectors Most important skills required to get hired How startups are innovating with interview formats Does chemistry workout in job interviews? If bit 7 of the control word is a logical 1 then the will be configured.

This functional configuration 82555 simple input operations for each of the three dhip.

Digital Logic Design Interview Questions. The Intel or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the qrchitecture half of the s for the Intel microprocessor.


Analogue electronics Practice Tests. How to design your resume? It can be programmed in mode 0 and mode 1. Embedded C Interview Questions. Combination of MODE 1. Both “pull-up” and “pull-down” bus-hold devices are present on Port A.

Read This Tips for writing resume in slowdown What do employers look for in a resume? Output data from the CPU architectjre the ports or control register, and input data to the CPU from the ports or status register are all passed through the buffer.

Definition of Microprocessor 1. Views Read Edit View history. Microprocessor And Its Applications. Each of the Group A and Group B control blocks receives control words from the CPU and issues appropriate architecturf to the ports associated with it.

Both Inputs and Outputs are latched. This port can be divided into two 4-bit ports under the mode control.

Explain with block diagram working of PPI.

The two halves of port C can be either used together as an additional 8-bit port, or they can be used as individual 4-bit ports. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. So, without latching, the outputs would become invalid as soon as the write cycle finishes. Architecrure a great Resume: Group A and Group B Controls The functional configuration of each port is programmed by the systems software.

In essence, a response from the peripheral device indicating that it has received the data output pppi CPU. This is required because the data only stays on the bus for one cycle.


Mode 2 — Bi-Directional Bus. It is architecthre active-low signal, i. The A contains three 8-bit ports AB, and C. All information read from and written to the occurs via these 8 data lines. This has an 8-bit latched and buffered output and an 8-bit input latch. Two 8-bit ports and two 4-bit port Any port can be input or output.

Outputs are not latched. It has the ability to use with almost any microprocessor. They can be connected to peripheral devices. By using this site, you agree to the Terms of Use and Privacy Policy. Digital Communication Interview Questions. Retrieved 26 July During the execution of the systems program any of the other modes may be selected using a single output Instruction.

Report Attrition rate dips in corporate India: The input pins for the control logic section are described arcbitecture. In essence, it allows the CPU to “read from” the This page was last edited on 23 Architectugeat Explain with block diagram working of PPI.

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