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 functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. In this mode, the may be used to adtasheet the system 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 for each port or a control register, as listed below:. 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.

The control intfl chip select CS pin 6 is used to enable the chip. Views Read Edit View history. This mode is selected when D 7 bit of the Control Word Register is 1. Interrupt logic is supported. The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

A Datasheet(PDF) – Intel Corporation

Only port A can be initialized in this mode. Input and Output data are latched. Since the two halves of port C are independent, they may be used such that one-half is inte, as an input port while the other half is initialized as an output port. 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.

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The ‘s datxsheet 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 Retrieved 3 June It was later cloned by other manufacturers. 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.

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. This means that data can be input or output on the same eight lines PA0 – PA7. Microprocessor And Its Applications. Since the two datashfet 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 port A and port B can be initilalised to operate datasyeet different modes, i.

Retrieved 3 June Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

Some of the pins of port C function as handshake lines. The is also directly compatible with the Zas well as many Intel processors. Only port A can be initialized in this mode. Some of the pins of port C function as handshake lines.

Retrieved 26 July Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. If an input changes while the port is being read then the result may be indeterminate. For example, daatsheet 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 from ” https: This means that data can be input or output on the same eight lines PA0 – PA7.

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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 is datasheeh member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. Intel Intel D 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.

In this mode, the may be used to extend the inhel bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller. From Wikipedia, the free encyclopedia. Interrupt logic is supported. Port A dataxheet be used for bidirectional handshake data transfer.

All of these chips were originally available in a pin DIL package.

Acknowledgement and handshaking signals are lntel to maintain proper data flow and synchronisation between the data transmitter and receiver. Input and Output data are latched.

It is an active-low signal, i.