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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Programmable Peripheral Interface

Embedded C Interview Questions. From Wikipedia, the free encyclopedia. Digital Logic Design Practice Tests. Input and Output data are latched. 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.

Digital Electronics Practice Tests. These three ports are further classified into two groups, i.

Intel – Wikipedia

Only port A can be initialized in this mode. Digital Logic Design Interview Questions. Tutorial of Microprocessor, assembly etc. Retrieved 3 June All Mask flip-flops are automatically reset during mode selection and device aarchitecture. These two groups can be programmed in three different modes, i.


The ‘s outputs are latched to hold the last data written to them. Survey Most Productive year for Staffing: Have you ever lie on your resume? Computer architecture Interview Questions. A high on this output can be used to interrupt the CPU for both input or output operations.

Intel 8255

A “low” on this input pin enables the communcation between the and the CPU. Group A and Group B Controls. Control words and status information are also transferred through the data bus buffer. Embedded Systems Interview Questions.

This port can be divided into two 4-bit ports under the mode control. When we wish to use port A or port B for handshake strobed input or output operation, we initialise that port in mode 1 port A and port B xrchitecture be initilalised to operate in different modes, i.

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. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Digital Communication Interview Questions. Mode 1 Basic Functional Definitions: All information read from and written to the occurs via these 8 data lines.


Each 4-bit port contains a 4-bit latch and it can be used for the control signal output 825 status signal inputs in conjunction with ports A and B. They are normally connected to the least significant bits of the address bus A0 and A1. Explain with block diagram working of PPI. Combination of MODE 1. This means that data can be input or output on the same eight lines PA0 – PA7.

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