INTEL 8255 DATASHEET PDF

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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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This mode is selected when D 7 bit of the Control Word Register is 1. This mode is selected when D 7 bit of the Control Word Register is 1.

Input and Output data are latched.

It is an active-low signal, i. Itnel of the pins of port C function as handshake lines. 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, consider an input device connected to at port A. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. From Wikipedia, the free encyclopedia. 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.

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 dataeheet is a member of the MCS Family of chips. Since the two datadheet 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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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.

Intel 8255

Input and Output data are latched. 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.

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.

If an input changes while the port is being read then the result may be indeterminate. Port A can be used for bidirectional handshake data transfer.

inteo 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. By using this site, you agree to the Terms of Use and Privacy Policy. As an example, if it is needed that PC 5 be set, then in the control word. It is an active-low signal, i.

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Only port A can be initialized in this mode. Some of the pins of port C function as handshake lines. Intl, without latching, the outputs would become invalid as intl as the write cycle finishes.

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 or output portPC0, PC1 and PC2 pins function as handshake lines.

A Datasheet(PDF) – Intel Corporation

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. Acknowledgement and handshaking signals are provided to maintain proper data flow and datawheet between the data transmitter and receiver. Interrupt logic is supported. Views Read Edit View history.

Microprocessor And Its Applications. All of these chips were originally available in a pin DIL package. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. Only port A can be initialized in this mode. For example, if port B and upper port C have to be initialized as input ports and lower port C and port A as intell ports all in mode Retrieved 3 June The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1].