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.

Author: Mojin Tauk
Country: Lebanon
Language: English (Spanish)
Genre: Life
Published (Last): 9 November 2014
Pages: 379
PDF File Size: 11.37 Mb
ePub File Size: 16.77 Mb
ISBN: 845-8-58462-699-4
Downloads: 94321
Price: Free* [*Free Regsitration Required]
Uploader: Doutilar

It is an active-low signal, i.

This mode is selected when D 7 bit of the Control Word Register is 1. Input and Output data are latched. It is an active-low signal, i. 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 All of these chips were originally available in a pin DIL package. Input and Output data are latched.

Intel 8255

As an example, consider an input device connected to at port A. Only port A can be initialized in this mode. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:.

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 also directly compatible with the Zas well as many Intel processors. For port B in this mode irrespective of whether is acting as an input port datassheet output portPC0, PC1 and PC2 pins function as handshake lines.

The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

  AN17830A DATASHEET PDF

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. Only port A can be initialized in this mode. datasheeet

A Datasheet(PDF) – Intel Corporation

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 855a operate in different modes, i. Since the two halves of port C are independent, dayasheet may be used such that one-half is initialized as an input port while the other half is initialized as an output port. 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.

If from the previous operation, port A is initialized as an output port and if is not reset dstasheet 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.

Intel Intel D 8255aa 26 July Port A can be used for bidirectional handshake data transfer. By using this site, you agree to the Terms of Use and Privacy Policy. Interrupt logic is supported.

If an input changes while the port is being read then the result may be indeterminate. So, without latching, the outputs would become invalid as soon as the write cycle finishes.

This is required because the data only stays on the bus for one cycle. As an example, if it is needed that PC 5 8255w set, then in the control word. Port A can be used for bidirectional handshake data transfer.

  HITACHI STARBOARD FX-79E1 PDF

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 inputs are not latched because the CPU only has to read their current values, then store datqsheet data in a CPU register or memory if it needs to be referenced at a later time. The Intel or i Programmable Peripheral Interface PPI chip was developed datasheef manufactured by Intel in the first half of the s for the Intel microprocessor.

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 Datahseet of chips.

It was later cloned by other manufacturers.

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

Datasheeg 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 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.

The two modes are selected on the basis of the value present at the D 7 bit of the control datazheet register. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. Retrieved 3 June Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.