8255A DATASHEET PDF

The Intel (or i) programmable peripheral interface (PPI) chip was developed and manufactured by Intel in the .. “Intel 82c55 PPI Datasheet” (PDF) . Title, System Components. Description, Programmable Peripheal Interface. Company, Intel Corporation. Datasheet, Download A datasheet. Quote. A datasheet, A circuit, A data sheet: AMD – Programmable Peripheral Interface iAPX86 Family,alldatasheet, datasheet, Datasheet search site for.

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Intel – Wikipedia

Input and Output data are latched. Address lines A 1 and A 825a allow to access a data register for each port or a control register, as listed below:. This means that data can be input or output on the same eight lines PA0 – PA7. For port B in this mode irrespective of whether is acting as an input port dataaheet output portPC0, PC1 and PC2 pins function as handshake lines.

Some of the pins of port C function as handshake lines. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

As an example, consider an input device connected datasheft at port A. Input and Output data are latched. By using this site, you agree to the Terms of Use and Privacy Policy. 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.

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 control signal chip select CS pin 6 is used to enable the chip. Interrupt logic is supported.

All of these chips were originally available in a pin DIL package.

Intel 8255

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. 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 daatsheet to a slave microprocessor or to transfer data bytes to and from a floppy disk controller.

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Retrieved 3 June Retrieved 3 June The two halves of port C can be either used together as an additional 8-bit port, or datsheet can be used as individual 4-bit ports.

Interrupt logic is supported. The is also datashet compatible with the Zas well as many Intel processors. This mode is selected when D 7 bit of the Control Word Register is 1.

This means that data can be input or output on the same eight lines PA0 – PA7. It is an active-low signal, i. Some of the pins of port C function as handshake lines. 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 functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Microprocessor And 855a Applications. 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 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 later time.

If an input changes while the port is being read then the result may be indeterminate. The ‘s outputs are latched to hold the last data written to them. This is required because the data only stays on the bus for one cycle.

Only port A can be initialized in this mode. Retrieved 26 July The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. The two modes are selected on the basis 8255w the value present at the D 7 datasneet of the control word register. 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. 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.

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As an example, if it is needed that PC 5 be set, then in the control word. It is an active-low signal, i. So, without latching, the outputs would become invalid as soon as the write cycle finishes. As an example, consider an input device connected to at port A.

Port A can be used for bidirectional handshake data transfer. 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.

Intel Intel Datasheey In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes datashete and from a floppy disk controller.

Microprocessor And Its Applications. This page was last edited on 23 Septemberat 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.

From Wikipedia, the free encyclopedia. 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.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

It was later cloned by other manufacturers. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. Retrieved from ” https: The two modes 82255a selected on the basis of the value present at the D 7 bit of the control word register.

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