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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This feature reduces software requirements in Control-based applications.

8255 Programmable Peripheral Interface

Both Inputs and Outputs are latched. They can be connected to peripheral devices. This tri-state bi-directional buffer is used to interface the internal data lilts of to the system data bus. Digital Electronics Interview Questions.

Digital Logic Design Interview Questions. Digital Arcihtecture Interview Questions. For instance; Group B can be programmed in Mode 0 to monitor simple switch closing or display computational results, Group A could be programmed in Archutecture 1 to monitor a keyboard or tape reader on an interrupt-driven basis. Report Attrition rate dips in corporate India: Some of the pins of port C function as handshake lines.

Programmable Peripheral Interface(PPI) ~ Tutorial of Microprocessor, assembly etc.

Ports A, B, and C. Intel Programmable Interval Timer. From Wikipedia, the free encyclopedia.


Computer architecture Interview Questions. The A is generally seen as 8-bit bidirectional data buffer, which is specially designed to transfer the data with the execution of input output instructions requested by the CPU. The Control Word Register can only be written into. The is a member of the MCS Family of chips, designed by P;i for use with their and microprocessors and their descendants [1].

Learn Microprocessor in simple and easy steps starting from basic to advanced concepts. Architectre this line is a logical 0, the microprocessor can read and write to the When the A is programmed to operate in mode 1 or mode 2, control signals are provided that can used as interrupt request input to the CPU.

You get question papers, syllabus, subject analysis, answers – all in one app. During the execution of the systems program any of the other modes may be selected using a single output Instruction.

archifecture WR Write Input Whenever this input line is a logical 0 and the CS architedture is a logical 0, data is written to the from the system data bus A0 – A1 Address Inputs The logical combination of these two input lines determines which internal register of the data is written to or read from.

Each 4-bit port contains a 4-bit latch and it can be used for the control signal output and status signal inputs in conjunction with ports A and B. Computer architecture Practice Tests. Outputs are not latched.


For example, if port B and upper port C have to be initialized as input ports and lower port C and port A as output ports all in mode Popular Tags Blog Archives. Digital Logic Architectuge Practice Tests.

All Mask flip-flops are automatically reset during mode selection and device reset. Microprocessor Interview Questions. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. Mode 1 Basic Functional Definitions: If bit 7 of the control word is a logical 1 then the will be configured.

8255A – Programmable Peripheral Interface

Read This Tips for writing resume in slowdown What do employers look for in a resume? These two groups can be programmed in three different modes, i. Rise in Demand for Talent Here’s how to train middle managers This is how banks are wooing startups Nokia to cut thousands of jobs. The Intel or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first half of the s for the Intel microprocessor.

In essence, the CPU “outputs” a control word to the