8255 INTERFACING WITH 8051 PDF

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. The wasn't originally designed to be connected to the Z There are several different operating modes for the and these modes must be defined by the CPU writing programming or control words to the device

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Note that the is obsolete, and has been obsolete for many years. Why not just choose an derivative with on-baord flash, and sufficient IO that you don't need an ? Read the datasheet for the This will tell you what signals you must provide to the , and the timing requirements for them.

Here you may meet your first problem: where will you find the datasheet for an obsolete device? You might find a datasheet somewhere, but how can you be sure that it precisely mathches the actual chip that you have in your hand? The so-called "after market" suppliers are in business to supply obsolete parts to existing users - they probably do not have the resources to support designing obsolete parts into new systems!

Implement it! You should now have sufficient information to enable you to proceed. One of the problems with this antique is that there is no such thing as an Are you making something from a book by an author that is too lazy to update to current technology? You could in all fairness say the same thing about the But then, you don't always need the latest technology to solve a problem.

I agree that a newer derivative with extended interrupt support would seem to be a better solution to the problem, though. A board with fewer chips is generally cheaper, lower power, more reliable, and easier to debug.

In this case, the school would presumably provide the necessary materials datasheets, etc as handouts, in textbooks, or whatever. View all questions in Keil forum. Site Search User. Software Tools. Reply Cancel Cancel. Up 0 Down Reply Accept answer Cancel. More questions in this forum.

All recent questions Unread questions Questions you've participated in Questions you've asked Unanswered questions Answered questions Questions with suggested answers Questions with no replies. Not Answered. Note for us 0 Run time error Microcontroller Compilation error Syntax error. Started 3 hours ago by INeedToLearn. Latest 5 hours ago by Adam Lins. Latest 14 hours ago by R. Suggested Answer. Latest 1 day ago by ahmet. Latest 1 day ago by Andy Neil.

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8255A - Programmable Peripheral Interface

We can program it according to the given condition. It can be used with almost any microprocessor. We can assign different ports as input or output functions. Port C is further divided into two 4-bit ports i. Port B can work in either mode or in mode 1 of input-output mode. Port A can work either in mode 0, mode 1 or mode 2 of input-output mode. It has two control groups, control group A and control group B.

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inforamtion about 8255 interfacing with 8051 microcontrollers

Note that the is obsolete, and has been obsolete for many years. Why not just choose an derivative with on-baord flash, and sufficient IO that you don't need an ? Read the datasheet for the This will tell you what signals you must provide to the , and the timing requirements for them. Here you may meet your first problem: where will you find the datasheet for an obsolete device? You might find a datasheet somewhere, but how can you be sure that it precisely mathches the actual chip that you have in your hand?

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