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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Each datxsheet of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. Views Read Edit View history. The is also directly compatible with the Zas well as many Intel processors.

Microprocessor And Its Applications. The ‘s outputs are latched to hold the last data written to them. Retrieved from ” https: This means that data can be input or output on the same eight lines PA0 – PA7.

dataxheet 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 is an active-low signal, i. By using this site, you agree to the Terms of Use and Privacy Policy.

This page was last edited on 23 Septemberat If an input changes while the port is being read then the result may be indeterminate. As an example, consider an input device connected to at port A.

The Intel or i programmable peripheral interface PPI chip satasheet 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.

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. Microprocessor And Its Applications. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. From Wikipedia, the free encyclopedia.

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The control signal chip select CS pin 6 is used to enable the chip. Only port A can be initialized in this mode. 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 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.

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

Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. All of these chips were originally available in a pin DIL package. Retrieved 26 July Retrieved 3 June It is an active-low signal, i. Retrieved 3 June Input and Output data are latched. As an example, consider an input device connected to at port A.

Intel 8255

The i was also used inttel the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. Intel Intel D The two modes are selected on the basis of the value datzsheet at the D 7 bit of the control word register.

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. 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. Port A can be used for bidirectional handshake data transfer. 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.

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When we wish to use port A or port B 2855 handshake inte, 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.

Interrupt logic is supported. 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. So, without latching, the outputs would become invalid as soon as the write cycle finishes. It was later cloned by other manufacturers. Input and Output data are latched. 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 adtasheet.

A Datasheet(PDF) – Intel Corporation

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