INTEL 8255 PPI PDF

communication between the A and the CPU. The A is a programmable peripheral interface. (PPI) device designed for use in Intel microcomputer. PPI is a general purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard etc. We can program . PPI •The INTEL is a 40 pin IC having total 24 I/O pins. consisting of 3 numbers of 8 –bit parallel I/O ports (i.e. PORT A, PORT B.

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For port B in this mode ijtel of whether is acting as an input port or output portPC0, PC1 and PC2 pins function inttel handshake lines. It is used to interface to the keyboard and a parallel printer port in PCs usually as part of an integrated chipset. It is an active-low signal, i. Required MD control word: My presentations Profile Feedback Log out.

There is also a Control port from the Processor point of view. The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. Views Read Edit View history. Only port A can be initialized in this mode. 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.

Microprocessor And Its Applications. Port A uses five signals from Port C as handshake signals for data transfer. Interrupt logic is supported. If the Port interrupt is enabled, INT is activated. Interrupt logic is supported. Acknowledgement and handshaking signals are provided to maintain proper data flow and synchronisation between the data transmitter and receiver. The functionality of the is now mostly embedded in larger VLSI processing chips as a sub-function. Retrieved 26 July The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

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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:.

Published by Loraine Cobb Modified over 3 iintel ago. All of these chips were originally available in a pin DIL package. Inputs are not latched.

If you wish to download it, please recommend it to your friends in any social system. Its contents decides the working of If an input changes while the port is being read then the result may be indeterminate.

Registration Forgot your password? Bit 7 of Port C. Each line ppj port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register. Each port can be programmed to function as simply an input port or an output port.

D – Programmable Peripheral Interface

inntel Auth with social network: 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 Feedback Privacy Policy Feedback. When CS Chip select is 0, is selected for communication by the processor.

Some of the pins of port C function as handshake lines. Input and Output data are latched. To use this website, you must agree to our Privacy Policyintl cookie policy.

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PPI PPI Programmable Peripheral Interface. – ppt video online download

By using this site, you agree to the Terms lpi Use and Privacy Policy. The ‘s outputs are latched to hold the last data written to them. Since the two halves of port C are independent, they may be used 8525 that one-half is initialized as an input port while the other half is initialized as an output port.

The chip select circuit connected to the CS pin assigns addresses to the ports of 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.

D8255 – Programmable Peripheral Interface

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. This is required because the data only stays on the bus ijtel one cycle. Get code and repeat in infinite loop.

They can be configured as either as input or output ports. To make this website work, we log user data and share it with processors. This page was last edited pp 23 Septemberat Processor reads the status of the port for this purpose Each port uses three lines from ort C as handshake signals.

As an example, consider an input device connected to at port A. Untel 3 June