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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Have you ever lie on your resume? After the reset is removed the A can archiyecture in the input mode with no additional Initialization required. The functional configuration of each port is programmed by the systems software.

Each of the Group A and Group B control blocks receives control words from the CPU and issues appropriate commands to the ports associated with it.

Views Read Edit View history. In essence, a response from the peripheral device indicating that it has received the data output by CPU.

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.


Port A can be used for bidirectional handshake data transfer.

The Control Word Register can only be written into. Jobs in Meghalaya Jobs in Shillong.

8255A Programmable Peripheral Interface Microprocessor

By using this site, you agree to the Terms of Use and Privacy Policy. All peripheral ports are set to the input mode. Data is transmitted or received by the buffer upon execution of input or output instructions by the CPU.

They can be connected to peripheral zrchitecture. These two groups can be programmed in three different modes, i. Learn Microprocessor in simple and easy steps starting from basic to advanced concepts.

There are three basic modes of operation that can be selected by the systems software: Evolution of Microprocessor History of the microprocessor! A “low” on this input pin enables the communcation between the and the CPU.

Intel A Programmable Peripheral Interface

The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. 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. For port B in this mode irrespective of whether is acting as an input port or output portPC0, PC1 and PC2 pins function as handshake lines.


Retrieved 26 July Analog Communication Interview Questions. Retrieved 3 June As an example, consider an input device connected to at port A.

Survey Most Productive year for Staffing: Otherwise, the output buffer will be in the high impedance state. Digital Logic Design Interview Questions.

Retrieved from ” https: All Mask flip-flops are automatically reset during achitecture selection and device reset. The control logic block accepts control bus signals as well as inputs from the address bus, and issues commands to the individual group control blocks Group A control and Group B control.

Programmable Peripheral Interface

How to design your resume? This port can be divided into two 4-bit ports under the mode control. The 5-bit control port Port C is used for control and status for the 8-bit,bi-directional bus port Port A. All information read from and written to the occurs via these 8 data lines.