In MODE 1, each group may be programmed to have 8 lines of input or output. MODE 2 is a strobed bi-directional bus configuration. The is a 40 pin integrated circuit IC , designed to perform a variety of interface functions in a computer environment. All information read from and written to the occurs via these 8 data lines. All peripheral ports are set to the input mode.

Author:Malahn Kekasa
Language:English (Spanish)
Published (Last):17 February 2015
PDF File Size:9.29 Mb
ePub File Size:7.92 Mb
Price:Free* [*Free Regsitration Required]

How to design your resume? It stands for Read option. Select a valid country. Seller information eclectrons Delivery times may vary, especially during peak periods. Add to watch list Remove from watch list. Digital Logic Design Interview Questions.

Get an immediate offer. This is an active high signal. Interview Tips 5 ways to be authentic in an interview Tips to help you face your job interview Top 10 commonly asked BPO Interview questions 5 things you should never talk in any job interview Best job interview tips for job seekers 7 Tips to recruit the right candidates in 5 Important interview questions techies fumble most What are inteo questions in an Iintel Some of the pins of port C function as handshake lines.

Only port A can be initialized in this mode. Embedded Systems Practice Tests. Computer architecture Interview Questions. 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. Be the first to write a review. United States Import charges: From Wikipedia, the free encyclopedia.

Minimum monthly payments are required. Intel Read This Tips for writing resume in slowdown What do employers look for in a resume? Control words and status information is also transferred ibtel this bus. Jobs in Meghalaya Jobs in Shillong. Making a great Resume: Sign up using Email and Password.

Seller assumes all responsibility for this listing. Terms of Sale Items are guaranteed as described and as shown.

Please enter a valid ZIP Code. If from the previous operation, port A is initialized as an output port and if is not intle 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. Data is transmitted or received by the buffer with the input output instructions given by the CPU.

When we wish to use port A or port B for imtel 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. If you have questions or testing you wish us to do, make sure you ask before making a purchase. Computer architecture Practice Tests. Microprocessor Interview Questions. Top 10 facts why you need a cover letter? Digital Communication Interview Questions.

Post as a guest Name. Add to watch list. TOP Related Posts.


8255A - Programmable Peripheral Interface

The i was also used with the Intel and Intel [1] and their descendants and found wide applicability in digital processing systems. It was later cloned by other manufacturers. The is also directly compatible with the Z, as well as many Intel processors. Data is transmitted or received by the buffer upon execution of input or output instructions by the CPU. Control words and status informa-tion are also transferred through the data bus buffer.



Mode selection bits, D2, D5, D6 are all 0 for mode 0 operation. 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. 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. Input ports are buffered, not latched. Ports do not have handshake or interrupt capability.

Related Articles