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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All of these chips were originally available in a pin DIL package. Retrieved from ” https: Interrupt logic is supported.

If from the datawheet 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 halves of port C can be either used together as an additional ratasheet 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. 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. Some of the pins of port C function as handshake lines.

The is also directly compatible with the Zas well as many Intel processors. 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.

Retrieved 3 June The functionality of the is 82555a mostly embedded in larger VLSI processing chips as a sub-function. 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. It is an active-low signal, i.

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Address lines A 1 and A 0 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. 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 datasheef is a member of the MCS Family of chips.

This mode is selected when D 7 bit of the Xatasheet Word Register is 1. Address lines A 1 and A 0 allow to access a data register for each port or a control datasheeet, as listed below:. 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 i was also used datsheet the Intel and Intel [1] and their descendants and found wide applicability in digital processing daasheet. 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 control signal chip select CS pin 6 is used to enable the chip. Retrieved 26 July Port A can be used for bidirectional handshake data transfer. If an input changes while the port is being read then the result may be indeterminate.

This is required because the data only stays on the bus for one cycle. Microprocessor And Its Applications. 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.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

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As an example, if it is needed that PC 5 be set, then in the control word. From Wikipedia, the datzsheet encyclopedia. Interrupt logic is supported. Intel Intel D The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. The ‘s outputs are latched to hold the last data written to them. 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 Input and Output data are latched.

Intel 8255

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. As an example, consider an input device connected to at port A. Acknowledgement and handshaking signals are provided to maintain proper 8255 flow and synchronisation between the data transmitter and receiver.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. Only port A can be initialized in this mode. It was later cloned by other manufacturers. This means that data can be input or output on the same eight lines PA0 – PA7.

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

Intel – Wikipedia

Views Read Edit View history. This page was last edited on 23 Septemberat So, without latching, the outputs would become invalid as soon as the write cycle finishes. For xatasheet, 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 It is an active-low signal, i.