8255 PPI DATASHEET PDF

A datasheet, A pdf, A data sheet, datasheet, data sheet, pdf, Intel, PROGRAMMABLE PERIPHERAL INTERFACE. INTEL (Programmable Peripheral Interface). In previous lectures we have discussed how to interface I/O devices with the system bys. If an input device. The Intel (or i) programmable peripheral interface (PPI) chip was developed and manufactured The i was also used with the Intel and Intel and their descendants and found .. “Intel 82c55 PPI Datasheet” (PDF ).

Author: Zulular Dolmaran
Country: Mauritius
Language: English (Spanish)
Genre: Health and Food
Published (Last): 9 August 2006
Pages: 392
PDF File Size: 2.41 Mb
ePub File Size: 13.6 Mb
ISBN: 902-4-19016-390-9
Downloads: 2283
Price: Free* [*Free Regsitration Required]
Uploader: Voodooshura

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.

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 Retrieved 26 July Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

Microprocessor And Its Applications. This mode is selected when D 7 bit of the Control Word Register is 1. It is an active-low signal, i. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver.

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. If an input changes while the port is being read then the result may be indeterminate. The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems.

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. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register.

Input and Output data are latched. Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. All of these chips were originally available in a pin DIL package.

  DIETA PREVENIMSS PDF

Only port A can be initialized in this mode. This page was last edited on 23 Septemberat Views Read Edit View history.

Intel Intel D Port A can be used for bidirectional handshake data transfer. 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. 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.

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. As an example, if it is needed that PC 5 be set, then in the control word. The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

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. Only port A can be initialized in this mode.

PPI interface for parallel port

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.

The Intel or i Programmable Peripheral Interface PPI chip was dataheet and manufactured by Intel in the first half of the s for the Intel microprocessor. Retrieved 3 June The is also directly compatible with the Zas well as many Intel processors. The poi 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. 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.

  IACRA 8710-1 PDF

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 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.

The ‘s outputs are latched to hold the last data written to them. This means that data can be input or output on the same eight lines PA0 – PA7. 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.

So, without latching, 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.

Peripheral Parallel Interface for Parallel Port

Microprocessor And Its Applications. It is an active-low signal, i.

This pli that data can be input opi output on the same eight lines PA0 – PA7. Port A can be used for bidirectional handshake data transfer. This is required because the data only stays on the bus for one cycle. 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 functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function.

Some of the pins of port C function as handshake lines.