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PAGE-1 youll have to study the architecture of solely the 3 smalls in question to know exact differences, but briefly we potentiometer distinguish between the 3 as: 8051 - 8 man micro found on CISC architecture ( compound plant counselling label Computer) moving-picture show - 8 human action micro establish on RISC architecture ( minify Instruction Set Computer) AVR - 8 bit micro found on RISC architecture ( Reduced Instruction Set Computer) there are also 16bit and 32 bit micros from the resembling family blind wise, 8051 is the forefather ( date of birth = 1985), next cam video s and then came the AVRs. its essential to guide 8051 to be subject to learn other micros. if we take to program line notice of these micros 8051 has 250 book of book of book of counselings which occupy 1 to 4 car staves to executive PIC has virtually 40 instructions which are mostly 4 cycles instructions AVRs have cxl instructions whcih are mostly 1 cycle based if we co me to speed factor: 1 machine cycle in 8051 (normal) separates the measure freq. by 12 ( some derivatives divide by 6 and by 1 also) 1 machine cycle in PIC divides the clock freq by 4 1 M.

C in AVRs divides the clock freq by 1 for eg: if we use 12 megacycle Xtal in all the 3 micros then the speed of execution will be as follows: 8051 = 12Mhz /12 = 1 Mhz i,e = 1 billion instructions per second PIC = 12Mhz/4 = 3 Mhz i,e = 3 million instructions per second AVR = 12Mhz/1 = 12 megacycle per second i,e = 12 Million instructions per second so you grass clearly see the that AVR executes much no:of instructions per given time and can be consid ered as the instant(prenominal) among the 3! . also 8051 consumes more(prenominal) power than the other two and PIC consumes the least power. twain PIC and AVR are RISC based but their instruction Sets are entirely different. from Programming ( i,e piece tag ) burden of view : 8051s are easy to code , next come PIcs and last comes AVRs. 8051 has very powerful instruction set, it has commands which do more complex calculations, it also has got strong arithmetical logic unit which makes computation simple. whereas PICs and AVRs...If you want to get a full essay, give it on our website: BestEssayCheap.com

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