8255A DATASHEET PDF

The Intel (or i) programmable peripheral interface (PPI) chip was developed and manufactured by Intel in the .. “Intel 82c55 PPI Datasheet” (PDF) . Title, System Components. Description, Programmable Peripheal Interface. Company, Intel Corporation. Datasheet, Download A datasheet. Quote. A datasheet, A circuit, A data sheet: AMD – Programmable Peripheral Interface iAPX86 Family,alldatasheet, datasheet, Datasheet search site for.

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This mode is selected when D 7 bit of the Control Word Register is 1. Interrupt logic is supported. As an example, if it is needed that PC 5 be set, then in the control word. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

The is also directly compatible with the Z dayasheet, as well as many Intel processors. So, without datashheet, the outputs would become invalid as soon as the write cycle finishes. 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 two modes are 8255z on the basis of the value present at the D 7 bit of the control word register. For port B in this mode irrespective of whether is acting as an input port dxtasheet output portPC0, PC1 and PC2 pins function as handshake lines.

Only port A datashset be initialized in this mode. 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 datasehet B can be initilalised to operate in different modes, i. Only port A can be initialized in this mode. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. Retrieved 3 June 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.

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Intel Intel D Retrieved from ” https: This is required because the data only stays on the bus for one cycle.

It was later cloned by other manufacturers. This page was last edited on 23 Septemberat For example, if port B and upper port C have to be initialized as input ports datqsheet lower port C and port A as output ports all in mode If an input changes while the port is being read then the result may be indeterminate.

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. Input and Output data are latched. Some of the pins of port C function as handshake lines. As an example, consider an input device connected to at port A.

Intel 8255

The two halves of port C can be either used together datasgeet an additional 8-bit port, or they can be used as individual 4-bit ports. This means that data can be input or output on the same eight lines PA0 – PA7. Port A can be used for bidirectional handshake data transfer.

When we wish to use port A or port B for handshake strobed input or output operation, we dahasheet that port in mode 1 port A and port B can be initilalised to operate in different modes, i.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register. It is an active-low signal, i. Retrieved 3 June Input and Output data are latched.

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A/82C55A Device Description(#) A/82C55A Device Description

Microprocessor And Its Applications. The two 2855a of port C can be either used together as an additional 8-bit port, or they can be used as individual 4-bit ports. 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.

This mode is selected when D 7 bit of the Control Word Register is 1. This means that data can be input or output on the same eight lines PA0 – PA7. 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.

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. The ‘s outputs are latched to hold the last data written to them. By using this site, you agree to the Terms of Use and Privacy Policy. The control signal chip select CS pin 6 is used to enable the chip. 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.

Interrupt logic is supported. It is an active-low signal, i.