communication between the A and the CPU. The A is a programmable peripheral interface. (PPI) device designed for use in Intel microcomputer. PPI is a general purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard etc. We can program . PPI •The INTEL is a 40 pin IC having total 24 I/O pins. consisting of 3 numbers of 8 –bit parallel I/O ports (i.e. PORT A, PORT B.

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This is required because the data only stays on the bus for one cycle. Required MD control word: If the Port interrupt is enabled, INT is activated. Get code and repeat in infinite loop.

Intel – Wikipedia

The features of the mode include the following: 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 It is an active-low signal, i.

Some of the pins of port C function as handshake lines. Retrieved 26 July Its contents decides the working of PC are used as handshake signals by Port A when configured in Mode 2. We think you have liked this presentation. So, without latching, the outputs would become invalid as soon as the write cycle finishes.

There is also a Control port from the Processor point of view. So they are shown as X Required MD control word: Share buttons are a little bit poi. By using this site, you agree to the Terms of Use and Privacy Policy. 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.

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To make this website work, we log user data and share it with processors. Requires insertion of wait states if used with a microprocessor using higher that an 8 MHz clock. Bit 7 of Port C. Ijtel CS Chip select is 0, is selected for communication by the processor.

This mode is selected when D 7 bit of the Intwl Word Register is 1.

Intel 8255

Interrupt logic is supported. To use this website, you must agree to inel Privacy Policyincluding cookie policy. Port A can be used for bidirectional handshake data transfer.

Auth with social network: This means that data can be input or output on the same eight lines PA0 – PA7. Retrieved 3 June When we wish to use port A or port B pli handshake strobed input or output operation, we initialise that port in mode 1 port A and port B can be initilalised to operate in different modes, i.

The chip select circuit connected to the CS pin assigns addresses to the ports of The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes untel and from a floppy disk controller.

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PPI PPI Programmable Peripheral Interface. – ppt video online download

Port A uses five signals from Port C as handshake signals for data transfer. Processor reads the status of the port for this purpose Input and Output data are latched. My presentations Profile Feedback Log out. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register.

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. Inputs are not latched.

Each port uses three lines from ort C as handshake signals. Feedback Privacy Policy Feedback. All of these chips were originally available in a pin DIL package. The two modes are selected on the basis of the value present at the D 7 bit of the control word register. Views Read Edit View history.

Retrieved from ” https: Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Each port can be programmed to function as simply an input port or an output port.

Input and Output data are latched.