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the 8051 microcontrroller is the name doesnt matter easy or not....but the maiin and imp diff between both is at89s51 represents the 8051 chip no....along with the name of company i.e atmel, so all n all both are same thing ......

89c51 have RISC architecture and contains less no of opcodes which are easy for programming. so iti is preferred than 8051.

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