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44758876-Eprom-Working.pdf

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Contents Ask a Question How To Order Page 8 How Does an Eprom work? NOTE: This is an older web site and some information is out of date. If you see something you wish to order, please go to the new web site and see the catalogue there. You can not place an order on this satcure-focus site. eturn to !at ure-#ocus $ome page. Simple as A B C D E F ail Bo!es The Eprom is a basic de%ice which can be considered simply as a bloc& of 'mail bo(es', each holding a message. Each 'bo(' is numbered
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    ContentsAsk a QuestionHow To OrderPage 8 How Does an Eprom work?  NOTE: This is an older web site and some information is out of date. If you see something you wish to order, please go to the new web site and see the catalogue there. You can not  place an order on this satcure-focus site.eturn to !at ure-#ocus $ome page. Simple as A B C D E F   ail Bo!es The Eprom is a basic de%ice which can be considered simply as a bloc& of 'mail bo(es', each holding a message. Each 'bo(' is numbered consecuti%ely. )t one end of the bloc& of 'bo(es' is a slot and by posting the )ddress or )**E!! of a  particular 'bo(' into this slot you will ma&e its message contents appear from the output slot at the other end of the bloc&.You can read the contents of )NY 'bo(' in this manner if you &now its number. essages in Code The actual message in each bo( consists of +ust eight numbers, each of which can be '' or ''.!o a typical message might be        The number of each bo( can also be represented as a code.#or instance:-  the first bo( address may be            and the second bo( could be            In practice, the bo( )**E!! is applied to the Eprom input pins as high or low %oltages representing '' or ''.The ONTENT! of the selected bo( appear on the eight Eprom output pins as high or low %oltages.#or instance the bo( with address:- A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 input pins 0 0 0 0 0 0 1 0 1 0 1 0 might ha%e the contents:- D7 D6 D5 D4 D3 D2 D1 D0 output pins 1 1 1 0 1 0 0 1 )s the )**E!! of each bo( is applied to the input pins, so the ONTENT! of that  bo( appear as %oltages on the  output pins. Bits in ine Eproms wor& /uite happily with binary codes consisting only of ''s and ''s, called 'bits'. 0e use the designations '' and '' simply for con%enience to represent high %oltage and low %oltage respecti%ely. The actual %oltages are usually not critical - high will be some positi%e %oltage e/ual to, or slightly less than, the supply %oltage. 1ow %oltage will usually be less than  %olt. The position of each 'bit' in line represents its actual %alue:-  128 64 32 16 8 4 2 1 the code 1 0 1 1 0 0 1 0 adds up to 178 in decimal.  Horri#le He! That was a little tedious to wor& out but it is difficult to use decimal with Eproms. To ma&e the numbers easier to deal with we can use the system called $e(adecimal. 2efore you shrie& in horror at this word let me ad%ise you that e%erything you e%er read about how difficult it is, is nonesense. It ma&es life %ery easy indeed.'$e(adecimal uses the base si(teen'. That means that you count up to 3, carry one, then start again. In fact we use letters to represent numbers bigger than 4, as follows:-  5 6 7 8 3 9  4 ) 2 * E ## represents ordinary decimal 8 and is as high as we go. To count higher we add another column and start again so ordinary 3 is represented by '' that;s 'one-<ero' $E=> and we count onwards in $E= ....  5 6 7 8 3 9  4 ) 2  * E #..and if you;%e followed so far you will understand that '#' $E= represents a 3 in the first column plus a 8 in the second ? 6 in decimal. an you see that '5' $E= must be 65 @ Now, we can con%ert binary to $E= %ery easily:- 8 4 2 1 0 0 0 0 = 0 0 0 0 1 = 1 0 0 1 0 = 2   0 0 1 1 = 3 0 1 0 0 = 4 0 1 0 1 = 5 0 1 1 0 = 6 0 1 1 1 = 7 1 0 0 0 = 8 1 0 0 1 = 9 1 0 1 0 = A 1 0 1 1 = B 1 1 0 0 = C 1 1 0 1 = D 1 1 1 0 = 

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Jul 23, 2017
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