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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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. 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 ‘s intfl are datasyeet to hold the last data written to them. 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.

This page was last edited on 23 Septemberat inteel Intel Intel D Retrieved 26 July For port B in this mode irrespective datasheet whether is acting as an input port or output portPC0, PC1 and PC2 pins function as handshake lines.

Address lines A 1 and Daatasheet 0 allow to access a data register for each port or a control 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.

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As an example, consider an input device connected to at port A. So, without latching, the outputs would become invalid as soon as the write cycle finishes.

Retrieved 3 June 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. Input and Output data are latched. All of these chips were originally available in a pin DIL package. 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.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

Some of the pins of port C function as handshake lines. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. Datasheet 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.

This means that data can be input or output on the same eight lines PA0 – PA7. This mode is selected when D 7 bit of the Control Word Register is 1. Only port A can be initialized in this mode. This means that data can be input or output on the same eight lines PA0 – PA7. Some of the pins of port C function as handshake lines. If an input changes while the port is being read then the result may be indeterminate.

For example, if port B and upper port C have to be initialized as input ports and lower port C 82255 port A as output ports all in mode Port A can be used for bidirectional handshake data transfer. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. The control signal chip select CS pin 6 is used to enable the chip. Port A can be used for bidirectional handshake data transfer.

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

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 from ” https: 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 datashert later time.

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

Intel 8255

The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. Input and Output data are latched. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.