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when i press "rebuild all target" button in uvision3 then i get a error as follow ---ERROR: can't execute 'C:\Keil\C51\BIN\C51.EXE' Target not created pls help me.
So you should not be surprised that it can't be executed, should you?!
C51.EXE is the executable file of the actual Compiler itself - if it doesn't exist on your PC, then you don't have a valid installation of the 8051 tools!
Note that the Compiler (C51.exe) is distinct from uVision - which is simply a graphical "front-end" user interface.
See the diagram & explanation here: http://www.keil.com/c51/devproc.asp
sir i installed uvision3 software.during installation there was no error.i want to compile a program written in c to get a hex code.pls help me.
What, exactly, do you mean by that?
uVision-3 is not supplied as a separate installation - it is only provided as part of a toolchain; ie, ARM, XC16x/C16x/ST10, C251, or C51
See: http://www.keil.com/product/
See also: http://www.keil.com/c51/devproc.asp
IF you just installed uVision without the rest of the C51 toolchain - then that is obviously your problem!
Note that uVision-3 is now discontinued anyhow - so whatever you have is well out-of-date.
If you have a full licence, you should speak to your supplier about this.
If you don't have a full licence, you should download the latest Evaluation version, and install that.
sir how to get c51 toolchain.if i install new version of uvision then does new version of uvision contain c51 toolchain?
www.keil.com/.../c51.htm
I think this might be a more appropriate link for the OP:
www.geekgirls.com/absolute_beginners_01.htm