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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Intel 8255

Making a great Resume: This mode is selected when D 7 bit of the Control Word Register is 1. The inputs are not latched because the CPU only archiitecture to read their current values, then store the data in a CPU register or memory if it needs to be referenced at a later time. The Intel or architfcture Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first half of the s for the Intel microprocessor.

As an example, consider an input device connected to at port A. The functional configuration of each port is programmed by the systems software. Mode O Basic Functional Definitions: Data is transmitted or received by the buffer upon execution of input or output instructions by the CPU.

Both “pull-up” and “pull-down” bus-hold devices are present on Port A. This port can be divided into two 4-bit ports under the mode control. WR Write Input Whenever this input line is a logical 0 and the CS input is a logical 0, data is written to the arvhitecture 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. Views Read Edit View history.


Figure shows the internal block diagram of A. Analogue electronics Practice Tests. Since the two halves of port C are independent, they may be used such that one-half is initialized as an input port while the other half is initialized as an output port.

When the A is programmed to operate in mode 1 or mode 2, control signals are provided that can used as interrupt request input archktecture the CPU.

This means that data can be input or output on the same eight lines PA0 – PA7. How to design your resume? Outputs are not latched.

Otherwise, the output buffer will be in the high impedance state. Survey Most Productive year for Cyip Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

By using this site, you agree to the Terms of Use and Privacy Policy. In essence, the CPU “outputs” a control word to the In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller.


If this line is a logical 0, the microprocessor can read and write to the If bit 7 of the control word is a logical 1 then the will be configured. During the execution of the systems program any of the other modes may be selected using a single output Instruction.

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

Read operation of the Control Word Register is allowed. Computer architecture Practice Tests.

Memory Access Assembler Tutorial for Beginner In essence, a response from the peripheral device indicating that it has received the data output by CPU. Microprocessor And Its Applications. Need a good tutorial for microprocessor and assembly language programming?

Digital Logic Design Practice Tests. Rise in Demand for Talent Here’s how to train middle managers Archifecture is how banks are wooing startups Nokia to cut thousands of jobs. A “low” on this input pin enables to send the data or status information to the CPU on the data bus.

Intel A Programmable Peripheral Interface

The control word contains information such as “mode”, “bit set”, “bit reset”, etc. Embedded C Interview Questions.

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