INTEL 8255 DATASHEET PDF

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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This is required because the data only stays on the bus for one cycle. Some of the pins of port C function as handshake lines.

A Datasheet pdf – PROGRAMMABLE PERIPHERAL INTERFACE – Intel

Address lines A 1 and A 0 allow to access a data register for each port or a control register, as listed below:. Retrieved 3 June Retrieved 26 July Input and Output data are latched. Only port A can be initialized in this mode.

As an example, consider an input device connected to at port A. Acknowledgement and handshaking signals are provided to maintain proper ijtel flow and synchronisation between the data transmitter and receiver. 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.

Programmable Peripheral Interface – Intel Chipset Datasheet

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 ‘s outputs are latched to hold the last data written to them. All of these chips were originally available in a pin DIL package. This means that data can be input or output on the same eight lines PA0 – PA7.

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

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.

Intel 8255

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. This page was last edited on 23 Septemberat 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.

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 datashewt all in mode This mode is selected when D 7 bit of the Control Word Register is 1. It is an active-low signal, i. 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 itel an output port.

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. 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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As an example, if it is needed that PC 5 be set, then in the control word. This means that data can be input or output on the same eight lines PA0 – PA7.

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

The Intel datasheet i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first half of the s for the Intel microprocessor. 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 control signal chip select CS pin 6 is used to enable the chip.

So, without latching, the outputs would become invalid as soon as the write cycle finishes. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Interrupt logic is supported. By using this site, you agree to the Terms of Use and Privacy Policy. Input and Output data are latched.