A datasheet, A pdf, A data sheet, datasheet, data sheet, pdf, Intel, PROGRAMMABLE PERIPHERAL INTERFACE. INTEL (Programmable Peripheral Interface). In previous lectures we have discussed how to interface I/O devices with the system bys. If an input device. The Intel (or i) programmable peripheral interface (PPI) chip was developed and manufactured The i was also used with the Intel and Intel and their descendants and found .. “Intel 82c55 PPI Datasheet” (PDF ).

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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 and is a member of the MCS Family of chips. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.

It was later cloned by other manufacturers.

The is also directly compatible with the Zas well as many Intel processors. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

The control signal chip select CS pin 6 is used to enable the chip. It is an active-low signal, i. As an example, consider an input device connected to at port A. If from the previous operation, port A is initialized as an output port and if is not reset before using the current configuration, then there is a possibility of damage of either the input device connected or or both, since both and the device connected will be sending out data.



The two modes are selected on the basis of the value present at the D 7 bit of the control word register. As an example, if it is needed that PC 5 be set, then in the control word.

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

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 we wish to use port A or port B for handshake strobed input datashwet output operation, we initialise that port in mode 1 port A and port B can be initilalised to operate in different modes, i.


8255 Programmable Peripheral Interface

Some of the pins of port C function as handshake lines. 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. Only port A can be initialized in this mode.

Port A can be used for bidirectional handshake data transfer. This means dqtasheet data can be input or output on dattasheet same eight lines PA0 – PA7. 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. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

Intel Intel D Interrupt logic is supported. Input and Output data are latched. Microprocessor And Its Applications. Retrieved 3 June