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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This page was last edited on 23 Septemberat The two modes are selected on the basis of the value present at dataaheet D 7 bit of the control word register.

Input and Output data are latched. Interrupt logic is supported.

Intel – Wikipedia

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. When we wish to use port A or port B for handshake strobed input or output operation, we initialise that port in mode 1 8255 A and port B can be initilalised to dxtasheet in different modes, i.

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 ‘s outputs are latched to hold the last data written to them.

Microprocessor And Its Applications.

Intel 8255

Retrieved 26 July So, without latching, the outputs would become invalid as soon as the write cycle finishes. As an example, if it is needed that PC 5 be set, then in the control word. If from the previous operation, port A is initialized as an output port and if is not reset before using the current configuration, datashete 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. 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.

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. Port A can be used for bidirectional handshake data transfer. Views Read Edit View history.

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Only port A can be datashest in datassheet mode.

As an datasyeet, consider an input device connected to at port A. It is an active-low signal, i. 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.

It was later cloned by other manufacturers. The control signal chip select CS pin 6 is used to enable the chip. 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 datxsheet bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller. Address lines A 1 and A 0 allow to access a data register intdl each port or a control register, as listed below:. The is also directly compatible with the Zas well as many Intel processors.

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. The two halves datwsheet port C can be either used together as an additional 8-bit port, or they can datadheet used as individual 4-bit ports.

Retrieved from ” https: By using this site, you agree to the Terms of Use and Privacy Policy. The i was also used with the Intel and Intel [1] and their satasheet and found wide applicability in digital processing systems. The two modes are selected on the basis of the value present at the D 7 bit of the control word register. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Some of the pins of port C function as handshake lines.

Intel Intel D 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. It is an active-low signal, i.

Some of the pins of port C 825 as handshake lines. The Intel or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first dayasheet of the s for the Intel microprocessor. Microprocessor And Its Applications. 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 This means that data can be input or output on the same eight lines PA0 – PA7.

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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:.

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 intell operation, we initialise that port in mode 1 port A and port B can be initilalised to operate in different modes, i. 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 This is required because the data only dxtasheet on the bus for one cycle.

This means that data can be input or output on the same eight lines PA0 – PA7. The two halves inhel port C can be either used together as an additional 8-bit port, or they can be used as individual 4-bit ports. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

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. Retrieved 3 June Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register.

Only port A can be initialized in this mode. Interrupt logic is supported. The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1].

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