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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From Wikipedia, the free encyclopedia. Microprocessor And Its Applications. 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. Since the two halves of port C are independent, they may be used inttel that one-half is initialized as an input port while the other half is initialized as an output port.

Port A can be used for bidirectional handshake data transfer. So, without latching, the outputs would become invalid as soon as the write cycle finishes. Views Read Edit View history.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. 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. Retrieved 3 June The is also directly compatible with the Zas well as many Intel processors.

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. 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.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

For port B in this intl irrespective of whether dataseet acting as an input port or output portPC0, PC1 and PC2 pins function as handshake lines. Inteo and Output data are latched.

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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. Intel Intel D This mode is selected when D 7 bit of the Control Word Register is 1. This is required because the data only stays on the bus for one cycle. 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 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.

Intel 8255

inrel It is an active-low signal, i. The two modes are selected on the basis of the value present at the D 7 bit of the control word register. 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.

Retrieved 26 July It was later cloned by other manufacturers. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Microprocessor And Its Applications.

Only port A can be initialized in this mode. Some of the pins of port C function as handshake lines. 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 system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller.

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Port A can be used for bidirectional handshake data transfer. 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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This means that data can be input or output on the same eight lines PA0 – PA7. As an example, consider an input device connected to at port A. If an input changes while the port is being read then the result may be indeterminate.

Some of the pins of port C function as handshake lines. As an example, consider an input device connected to at port A. This means that data can be input or output on the same eight lines PA0 – PA7. Interrupt logic is supported. As an example, if it is needed that PC 5 be set, then in the control word. 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 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.

Interrupt logic is supported. In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to ddatasheet from a floppy disk controller.

Intel – Wikipedia

Only dattasheet A can be initialized in this mode. Retrieved 3 June 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 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 The is ontel member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1].

The control signal chip select CS pin 6 is used to enable the chip. This page was last edited on 23 Septemberat