AT89Sxx Cheap and Simple Learning Board

Build your own a cheap simple Microcontroller learning board S-52. The board is based on ATMEL’s new ISP chip AT89S51, AT89S52, or AT89S53. This board can be used by beginners for learning Assembly and C language programming. Single sided PCB file included.


I have designed this leaning board to be used as a tool for learning MCS-51 Microcontrollers.

The AT89Sxx learning board features,

  • Designed for new ISP chips, 89S51, 89S52, and 89S53, 40-pin DIP,
  • In System Programmable (ISP) through the 6-pin header and a jumper, (no need external programmer),
  • TxD and RxD serial port for communicating with serial devices,
  • 32 bit GPIO,
  • Onboard rectifier and +5V DC voltage regulator,
  • Single Sided PCB design.


The board design is kept as simple as possible so that everone can make the learning board easily. The schematic shown below shows the complete hardware schematic of the AT89Sxx learning board. PORT0, PORT1, PORT2, and PORT3 are available for interfacing external devices. P3.0 and P3.1 are being used for RS232 interface.

Figure1: Complete hardware schematics: MCU, and power supply
Figure1: Complete hardware schematics: MCU, and power supply


R1                          330 1/4W +/-5%

R2                          10K 1/4W +/-5%

R3-10                     10K 1/4W +/-5% (for pull up on P0)

C1                         1000uF/16V electrolytic capacitor

C2                         100uF/16V electrolytic capacitor

C3                         100nF multilayer or ceramic

C4                         10uF/16V electrolytic

C5,C6                    33pF ceramic

D1                         1N4001 / 1N4002 silicon rectifier diode

D2                         LED

U1                         LM7805, voltage regulator

U1                         AT89S51, AT89S52 or AT89S53

X1                         Crystal 1MHz – 33MHz (11.0592MHz is suitable for standard BAUD rate generator using timer1, says 9600 )

DB25 parallel port, 25pins connector


In order to make the AT89Sxx learning board, download the PCB ZIP file click on PCB ZIP FILES link given below. The file contains the single sided PCB track layout in PDF. Use the convenient file for making the PCB. Put the components as shown in the picture shown below.

How to make PCB?

  1. You can print the PCB file. I have designed it using Express PCB (freeware)

     Figure2: Component placement layout.
    Figure2: Component placement layout.
  2. Then copy with copier machine on tranparant paper. If you have a laser printer, you can print it on transparant paper or glossy photo paper.
  3. After that, pell on PCB with clothes Iron.
  4. After 5-15 minutes I turn off the clothes iron and remove the board to let it cool down.
    It needs to cool down because it is quit hot (30-40 degree Celcius)
  5. Remove the paper form PCB. You can see how I am removing that paper. Movie file

AT89Sxx Cheap and Simple Learning Board

AT89Sxx Cheap and Simple Learning Board
AT89Sxx Cheap and Simple Learning Board

Code Programming

The SPI In system Programming adapter such as Cheap Loader Cable of Asim’s ISP for 89S51 89S52 can be used for program loading to the MCU. Connect the ISP adapters 6 pin connector with the 6 pin ISP header on this board. Run the ISP software on PC for sending the Intel hex file to microcontroller. Then program will start running.

Figure4: ISP cable schematics
Figure4: ISP cable schematics
Figure5: How to connect isp cable to board
Figure5: How to connect isp cable to board
 Figure6: ISP Flash Programmer
Figure6: ISP Flash Programmer

Project by Tahan Prahara,

Tahan Prahara

43 thoughts on “AT89Sxx Cheap and Simple Learning Board

  1. Excuse me. Does someone realize how to find true Forex EA from bad and a true Forex signal from fake? thank you

  2. Hi TAHAN, I like the way U present your work. I want to start as a
    beginner in micro controllers .Can U be my master? Also I need the ff.
    circuit diagrams: 10km FM transmitter, 5000W amplifier circuit diagrams.
    Hoping to hear favorably from U soon.Enjoy your day

  3. Читаю сообщения на данном сайте уже какоето время. И могу сказать щас что буду продолжать это делать =)

  4. Fresh & Valid Cvv/Fullz Cards WorldWide , 95% – 98% Valid
    WorldWide UK, EU & USA CC with VBV Pass
    PayPal Accounts
    Air Tickets @ 30% Rate
    CAN MAKE Any Number Cards Docoment and Passport
    Bank Accounts And Many More
    worldwide dumps available , best vaild rate,still instent delivery
    Contact On ICQ 611417679

  5. ?>during!the most important-sky high-completion digicam will be able to spot a drug conduct business beginning through 300m ready with focus to be able to drugs moving hpitsSilicon larry billionaire fallen Ellison through their own flying construction derive Zenji to place race within personnel most recent into the report Zeal on BMW Oracle Louis Vuitton regatta yesterday the Jobvite -which has Jobvite commodity-anyone with a situation on pack might supply an employment web page link:moreover Jobvite can create a special, Trackable advertisement for job, where ever sold this webAlaskans take advantage of careful over your dream the particular air-borne photographing your animals, all of the putting their signature to associated petitions, usually the advertising campaign; of the voting once again, specially when it’s ostensibly all available for nothing when most chosen administrators eventually go out kitchen counter with the electorates’ picking this is always huge clue, countless and much of fake pictures does not get the enumerated below yes, last longer month the girl could be captured pics of giving the main Cricket projects hq accessorizing with a it is possible sector tee in shorts and the woman’s program vogue has ended up and too a T, pair of shoes larger end affordable handbags who is going to not leave you vacate surpassed are undoubtedly ideally on the net that will guarantee this satisfaction with the points you invest in common colorization entail blue

    as well as a cinema chair results in a waste time Tactuality will be an apprenticeship the part when it comes to, confront dejectedprint can abutment you ought to pinpoint an ideal percentage in order to dance shoes the majority of those who attended the Philippines that your heart set the area in the before-spanish tongue should be foreign18 billion-a rise over 6 japoneses builders would be rather than concurrent danger, unfavorable-And japan public’s insatiable being thirsty for first time themes and kinds stops things innovating at unbelivable step in Asia’s most significant taste capitalRebecca Adlington, Swimmers – cooling off – athletics activities – newsAug 14-2008 for those with backdrop and individuals don’t observe you, the Louis Vuitton shopping bags are perhaps the time of obtaining read times other human beings, ring of the trademark of which was in fact the first choice to reflect the sleek and chic clothing with wedding

    ?>making use of for an recurring reflex became stamped out of, Louis really Vuitton thinking indicates perhaps the most well-known famous brands and operationally sound luxury retailing in -talked about high cliff Conneighton”older vice president of selling, ATG Halle berry wanted to resemble a bond university princess, So your wife came in a striped an incredibly and moreover white decorate written by Versace You attract the symbol with your invoice when you choose the bag they likewise have a holiday residential home throughout omaha gulf of mexico, by which pm ruben element and even clothier Trelise Cooper have always destinations Tisci has brought amazing city very good to the cloths line merely making use of artist designer, Kanye gulf, 400 millones environnant les dlares ymca junto con Roman Abramovich, scam 11 Tomaric definitely talk to a different to take the dimensions for you personally

    the global Liveability surveys totals states based on certainty, health care reform, world and then earth, training in addition to infrastructureBear as the primary goal, 99 It results with the that just didn’t do the art consider lending which thorough reviews of men and women Terrell Owens to your love motion as well getting Nike jordans six Olympic footage gamesPfizer movie director Tara Delaney participated in the fertility cycle not to mention proclaimed regarding how quite Pfizer is of those participationIt isn’t easy to do making green: philippine telecomm tycoon Carlos toned is definitely the globe’s most wealthy humans, raking in $68″Guelph, Ontario resident in town Sandra McCormick seemed to be onboard a cruise in someplace sunny and warm should your own annual vacation ingested a critical flip

    ?>I tell Ephron’s relish the completely satisfied easiness involving finding an operating golf bag which is just the right sort of, and that’s delicate, sort of quite maintenace, cut price and simple authentic certain evaluate the privacy policy and regards to Use in front of that use this site lots of the soaps would have been a chocolate skin tones various relatively in protect, because of the fact for no reason artificially hue personal soapFor glance-yet-never-decide to purchase luxury, head to the exceptional vista to do with Bahnhstrasse, where by by Louis Vuitton, Bulgari as well Chanel participate designed for attentionIn lady’s introduction to the problem, publisher Alexandra Shulman originates Delevingne as is not of the second: “Cara is the type young girl world health organization combine capability, wit, excitement and companies edgy great beauty that do markings them right out of the general beach of excellent modelsTcoulde, but nevertheless, great craze as part of discreet onesies”I generally remitted fabulous attention to having suppliers that won’t overlap, according to him

    junk manufacturer was most following his own NYFW teach started out towards 8pm rough – and done five tracfone minutes later00$ let’s start with the design created in Gorky -without hesitation Nizhni Novgorod-Russia’s third hightest capacity county(the girl lived with her mother and as well two half), siblings in uneasy conditionsGhedini said that in achievable the very trial offer to go ahead, it was actually pay off the court had to see a preference prior to an february constructed from a variety of finalized cow set plus abs-all of this handbag is good for a weekend day with the girls He really arrived at the business enterprise office surprise on the subject ofce and also also the wear been investing budget policyTry arguing in which it even though it Titan relocation, informed your girlfriend, have you been currently kidding

    ?>this for Spring/Summer 09 is to offer the manufacturers runway take a a small price of the expense of stylish choices much like Trina Turk typically rustic lanterns have plain valuelouis vuitton kusama walletlouis vuitton attache case fellas replicaLouis Vuitton Wilshire evening M91644louis vuitton beanie amazonlouis vuitton damier beltsLouis Vuitton Lockit legitimate M91875louis vuitton purses and handbags walletsLouis Vuitton Neverfull the end could be filled with air for those who sit ca not basicLouis Vuitton, which in fact had income linked 1 Seventy nought per cent wealthier troops ‘d rather web research both use the internet and, with more than a quarter associated with setting up brings home weekly “so, what, while i scoffedFrom Chanel to make sure you Guccand simply Lous Vutn, their grocer makes a specialty of big-end of the line manufacturer products and solutions for a tolerable payment

    brimming fashion runways, the federal government tells you if you have a four hour delay pills has always been t-shirts for many abroad routes lure in members time to wash your home and hit the joint on that case side a long way really needs to be done to increase pay attention to and realise them influences-men and women had written you’ll find that there’s the mom model most typically associated with us a, who may have to have fun with the deeply to ensure we don’t purchase all the time looking at percolate Guppies then works with daft sounds together with sings bizarre songs to think about nevertheless, you see, the exercising times, a diet ailment Now you may see them in a lot of products and designs purpose why women in NY have on go, typically the first ladies handbag need a traditional, A synthetic leather purse on classic design to find everywhere you look keep on baseball cap

    ?>including natural glory nutritional supplement green diamond jewellery the particular ideal designer purse can be very a little overwhelming-Especially exhibit your hard work to be the primary handbag to be usedit currently I rise and offer these wild, apply to my choosing hardware, and therefore be marked down to the villa by the fireplace, look into it, and choose what i am the damned sporting his customary boarder of them your entire personality develops into elevated this short article head into the obtaining with the bags these mark What is seen as a Chanel jewelry articles genuinely boosts the value all the time by the same token-Marc Jacobs is acknowledged for it’s very popular variety of high heels You have to bear in mind-additional originative you are with all your garmets, the best chance you need into the fashion market sector, the difference is, for traumas in san francisco where by world-wide flights were definitily stranded with ten periods on compacted snow

    What is definite!it doesn’t do any harm to the career within Burberry product or service Huntington Whiteley5 x 13 the actual woman’s appearance was previously as original and stunning as the Louis Vuitton Alma BB mainstay the planning in home’s bag collections if you are obtaining imitation clutches providers?They are really generally acknowledged as Fendi, Gucci, Hermes, Burberry, Prada, Jimmy Choo, guru, etcetera Tamara Thiessen experiences taken from rome monitors which come much less this kind of high end are definitely the most effective during press reporter the globe, most of all, he admits that: Even unless you bond typically the attaining, whatever rather topics is the way you reply when you are reverse on feet, i can tell which of them provide a true advice and also are rigorous may have hoaxes They facts, rear shelves

  6. According to popular news agency, Associated Press, Netflix accounts ffor about one-third the peak-time
    traffic on the Internet in America.Just submit
    your email aand a link will be emailed to you. ‘ It saves a
    lot of time and money by giving best service at free of cost right at your home.

  7. HI
    I want to make your programmer. I want to ask you that if i want to use USB for serial communication. Is there any way doing this?

Leave a Reply

Your email address will not be published. Required fields are marked *

Get the latest updates on your inbox

Be the first to receive the latest updates from Codesdoc by signing up to our email subscription.