8255A DATASHEET PDF

February 1, 2020   |   by admin

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

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 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. This means that data can be input or output on the same eight lines PA0 – PA7.

This means that data can be input or output on the 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.

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 from ” https: Retrieved 26 July 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.

This mode is selected when D 7 bit of the Control Word Register is 1. Port A can be used for bidirectional handshake data transfer. Interrupt logic is supported. Only port A can be initialized in this mode.

It is an active-low signal, i. If from the previous operation, port A is initialized as an output dataxheet and if is not reset before using the current configuration, then there is a possibility of damage datahseet either the input device connected or or both, since both and the device connected will be sending out data. Input and Output data are latched. The control signal chip select CS pin 6 is used to enable the chip. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.

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Interrupt logic is supported. 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. Some of the pins of port C function as handshake lines.

Intel Intel D The ‘s outputs are latched to hold the last 82555a written to them. Address lines A 1 and A 0 allow to access datasheey data register for each port or a control register, as listed below:. Microprocessor And Its Applications.

Intel 8255

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. By using this site, you agree to the Terms of Use and Privacy Policy. Microprocessor And Its Applications.

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. It was later cloned by other manufacturers.

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. Port A can be used for bidirectional handshake data transfer. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Retrieved 3 June Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

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. From Wikipedia, the free encyclopedia.

Views Read Edit View history. 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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Only port A can be initialized in this mode.

As an example, consider an input device connected to at port A. The two modes are selected on the basis of the value present at the D 7 bit of the control word register. Some of the pins of port C function as handshake lines.

Retrieved 3 June 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. Input and Output data are latched. The is also directly compatible with the Zas well as many Intel processors.

This is required because the data only stays on the bus for one cycle. 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.

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. The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1].

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

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. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register.