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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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. Retrieved 3 June It is an active-low signal, i. This page was last edited on 23 Septemberat 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. This means that data can be input or output on the same eight lines PA0 – PA7.

Input and Output data are latched. Address lines A 1 and A 0 allow to access a data register for each port 8255 a control register, as listed below:.

Views Read Edit View history. As an example, consider 82555 input device connected to at port A. Intel Intel D If from the previous operation, port A is initialized as an output port and if is not datassheet 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.

All of these chips were originally available in a pin DIL package. 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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For port B in this mode irrespective of whether inyel acting as an input port or output portPC0, PC1 and PC2 pins function as handshake lines.

A Datasheet(PDF) – Intel Corporation

As an example, consider an input device connected to at port A. The ‘s outputs are latched to hold the last data written to them.

Microprocessor And Its Applications. Microprocessor And Its Applications. The two halves of port C can be either inetl together as an additional 8-bit port, or they can be used as individual 4-bit ports.

Port A can be used for bidirectional handshake data transfer. By using this site, you agree to the Terms of Use and Privacy Policy. 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 and is a member of the MCS Family of chips. Input and Output data are latched. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed datsaheet.

Port A can be used for bidirectional handshake data transfer. It is an active-low signal, i. This is required because the data only stays on the bus for one cycle. From Wikipedia, the free encyclopedia. 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. Only port A can dtaasheet initialized in this mode. The is a member of the MCS Family inntel chips, designed by Intel for use with their and microprocessors and their descendants [1].

As an example, if datashet is needed that PC 5 be set, then in the control word. Some of the pins of port C function as handshake lines.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. The inputs are not latched because the CPU only has to read intek current values, then store the data in a CPU register or memory if it needs to be referenced at a later time.

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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.

If an input changes while the port is being read then the result may be indeterminate. Since the two halves of port C are independent, they may be used such that one-half is initialized as an input port dafasheet the other half is initialized as an output port. Retrieved from ” https: The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.

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

Retrieved 3 June 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. Interrupt logic is supported. It was later cloned by other manufacturers. Some of the pins of port C function as handshake lines. 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.

Acknowledgement and handshaking signals are provided 8255 maintain proper data flow and synchronisation between the data transmitter and receiver.