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Iam connecting microcontroller 8051 with my PC COM1 port to have serial communication. To have same voltage levels between PC and 8051 i have used MAX232 but i need to know what other components like capacitors and resistor i need to connect in between controller and MAX232. i have the data sheet but information is limited. so can any one suggest capacitor value and quanity and other minor components.
The Selection Table on the very first page of the data sheet has a column headed "Nominal Cap Value" What more do you need to know?!
Fig 5 in the data sheet shows you exactly how to wire up a MAX232.
i have capacitor all of 10uF but 10 Volts,but in datasheet it is indicated that some capacitor are of 10uF and 6.3 volts i think it will not effect but just asking will it effect the voltage levels conditions. since i will be using 10Uf 10 volts instead of 6.3 volts...as 6.3 volts are not avaiable any where in my region.
Ah - the voltage rating that you speak about is a limit. Thus if it specifies a 6.3volt capacitor, then a 10 volt capacitor will do the job just fine (although it may be physically slightly larger, and may cost a few percent more).
salutations, please send me documentation about Max232 and its communication with the sérial port in french if possible then in english
"please send me documentation about Max232" You need to go to the manufacturer for that: http://www.maxim-ic.com You can download the English version - I don't know if it's available in French. Try asking a local distributor?
the mistake made by several of the above posters id to refer Waquar to the data sheet, he does'nt read them. Erik
please can you send me a typical design dealing with the interficing of the 8051 cpu and the the max232 exuse me for my bad english greeting
"please can you send me a typical design dealing with the interficing of the 8051 cpu and the the max232" Just look on p17 of the MAX232 Data Sheet - the 8051 connects to the signals labelled "CMOS Inputs" and "CMOS Outputs" The Keil MCBx51 Evaluation Board uses a MAX232 - the schematic is in the MCBx51 User's Guide: http://www.keil.com/manuals/mcbx51.pdf There is example code in the downloads section of this site for doing interrupt-driven serial IO.
normally 1 microFarad with max 232. check the datasheet, everything is given in detail.
PLZ TELL DETAIL & DATA SHEET IC232 WITH SERIAL COMMUNICATION
"PLZ TELL DETAIL & DATA SHEET IC232 WITH SERIAL COMMUNICATION" DON'T SHOUT!!!!! (All-capitals is considered SHOUTING!) I've already posted a link to the manufacturer's website, and an example schematic using the device - what more do you want??!!
comunication serial by RS232?
"what more do you want??!!" He wants you to go round to his place and do the entire project for him. I'm tempted to say something about "wiping arses" but that might not be appropriate on this forum. I'm rapidly reaching the point where I'm going to stop visiting this forum unless Keil start moderating it. These "I'm a lazy cretin, gimme something" posts are starting to outnumber the real ones. What's more, they are almost always off topic - this place is supposed to be for the discussion of Keil tools, not a source of schematics or data sheets. Keil, here's a suggestion: Make the "Post" button really small. Alongside it, put a really large button marked "FREE SAMPLE CODES" (uppercase essential). When clicked this should go to a page with links for every appnote on the site. Give all the links names like "FREE SAMPLE SERIAL CODES", "FREE SAMPLE I2C CODES" etc. Another thing, when the "Post" button is clicked, how about popping up the question "DO YOU WANT FREE SAMPLE CODES?" with two buttons, "Yes" and "No". If "Yes" is clicked, request an email address and email all the appnotes to that address. Stefan
Case in point, this thread has 55 replies as of today. www.keil.com/.../thread2288.asp