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 mode is selected when D 7 bit of the Control Word Register is 1. This means that data can be input or output datqsheet the same eight lines PA0 – PA7. Port Lntel can be used for bidirectional handshake data transfer. If an input changes while datashret port is being read then the result may be indeterminate. Only port A can be initialized in this mode. Microprocessor And Its Applications. 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 two modes are selected on the basis of the value present at the D 7 bit of the control word register. It was later cloned by other manufacturers.

Intel 8255

This mode is selected when D 7 bit of the Control Intek Register is 1. Some of the pins of port C 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.

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.

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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. By using this site, you agree to the Terms of Use and Privacy Policy.

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

The is also directly compatible with the Zas well as many Intel processors. Input and Output data are latched. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function.

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

As an example, consider an input device connected to at port A. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. All of these chips were originally available in a pin DIL package. Retrieved 3 June Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. 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 modes are selected on the basis of the value present at the D 7 bit of the control word register. As an example, consider an input device connected to at port A.

It is an active-low signal, 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 control signal chip select CS pin 6 is used to enable the chip.

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Some of the pins of port C function as handshake lines. This means that data can be input or output on the same eight lines PA0 – PA7.

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.

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

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 stays on the bus for one cycle. Only port A can be initialized in this mode.

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. Retrieved 3 June This page was last edited on 23 Septemberat As an example, if it is needed that PC 5 be set, then in the control word. Interrupt logic is supported.