INTEL 8255 DATASHEET PDF

DATASHEET. The Intersil 82C55A is a high performance CMOS version of the industry standard A and is manufactured using a. The Intel (or i) Programmable Peripheral Interface (PPI) chip was developed and .. , Complete Description about the Intel IC; , Datasheet; , functions overview; The Intel (or i) Programmable Peripheral Interface (PPI) chip .. “PCI A Datasheet” (). 6.

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

Input and Output data are latched. Microprocessor And Its Applications. 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. Intel Intel D The ‘s outputs are latched to hold the last data written to them. It is an active-low signal, i. Port A can be used for bidirectional handshake data transfer. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

Interrupt logic is supported. It is an active-low signal, i. Microprocessor And Its Applications. As an example, consider an input device connected to at port A. Retrieved 26 July The is also directly compatible with the Zas well as many Intel processors. 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. 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.

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From Wikipedia, the free encyclopedia.

A Datasheet(PDF) – Intel Corporation

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. If an input changes while the port is being read then the result may be indeterminate. The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants 82555.

The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.

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.

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. Input and Output data are latched.

It was later cloned by other manufacturers. This mode is selected when D 7 bit of the Control Word Register is 1. For port B in this mode irrespective of eatasheet is acting as an input port or output portPC0, PC1 and PC2 pins function as handshake lines.

Views Read Edit View history. In this mode, the may be used to extend the kntel bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller.

Intel – Wikipedia

The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. 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 Dqtasheet and port B can datasheer initilalised to operate in different modes, i. Only port A can be initialized in this mode. The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

Interrupt logic is supported. So, without latching, the outputs would become invalid as soon as the write cycle finishes. Retrieved 3 June This is required because the data only stays on the bus for one cycle. The two modes are selected on the basis of dataeheet value present at the D 7 bit of the control word register.

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Only port A can be initialized in this mode. Retrieved 3 June In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to and from daatsheet floppy disk controller.

This means that data can be input or output on 82255 same eight lines PA0 – Intell. 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 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 control signal chip select CS pin 6 is used to enable the chip.

Intel 8255

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. As an example, consider an input device connected to at port A. This means inrel data can be input or output on the same eight lines Untel – PA7.

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. As an example, if it is needed that PC 5 be set, then in the control word.

The Intel or i programmable peripheral interface PPI chip was datashheet 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.