8255 PPI DATASHEET PDF

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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Intel 8255

This means that data can be input or output on the same eight lines PA0 – PA7. The control signal chip select CS pin 6 is used to enable the chip. This mode is selected when D 7 bit of the Control Word Pli is 1.

This means that data can be input or output on the same eight lines PA0 – PA7. Since the two halves of port C are independent, they may be used such that one-half is initialized as an input datwsheet while the other half is initialized as an output port. Interrupt logic is supported. By using this site, you agree to the Terms of Use and Privacy Policy.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

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.

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. Only port A can be initialized in this mode. Retrieved 3 June The datasheett was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. As an example, consider an input device connected to at port Datasheeet. 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 Retrieved 3 June Input and Output data 82255 latched.

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Input and Output data are latched.

It is an active-low signal, i. The two modes are selected on the basis of the value present at the D 7 bit of the control word register. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

8255 Programmable Peripheral Interface

Some of the pins of port C function as handshake lines. The inputs are not latched because the CPU only has to read their current values, then store the data in a CPU register or memory if it needs to be referenced at a 825 time. From Wikipedia, the free encyclopedia.

The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. It was later cloned by other manufacturers. 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 can be initilalised to operate in different modes, i.

Microprocessor And Its Applications. As an example, if it is needed that PC 5 be set, then in the control word. It is an active-low signal, i.

The is also directly compatible with the Zas well as many Intel processors. Only port A can be initialized in this mode. The Intel or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the datasueet half of the s for the Intel microprocessor.

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

Interrupt logic is supported. 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. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. 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 datqsheet the device connected will be sending out data.

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Some of the pins of port C function as handshake lines. Retrieved 26 July In this mode, the may be used to extend 2855 system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller.

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. All of these chips were originally available in a pin DIL package. The two halves of port C can be either used together as an additional 8-bit port, xatasheet they can be used as individual 4-bit ports.

Programmable Peripheral Interface – Intel Chipset Datasheet

As an example, consider an input device connected to at port A. This mode is selected when D 7 bit of the Control Word Register is 1. 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.

Port A can be used for bidirectional handshake data transfer.