youll have to study the architecture of solely the 3 smalls in question to know exact differences, but briefly we tummy distinguish between the 3 as: 8051 - 8 small-arm micro found on CISC architecture ( composite plant counselling Set Computer) moving-picture show - 8 bit micro based on RISC architecture ( Reduced Instruction Set Computer) AVR - 8 bit micro based on RISC architecture ( Reduced Instruction Set Computer)
there are also 16bit and 32 bit micros from the same family blind wise, 8051 is the forefather ( date of birth = 1985), next cam PIC s and then came the AVRs. its essential to guide 8051 to be able to learn other micros. if we come to program line set of these micros 8051 has 250 book of book of instructions which occupy 1 to 4 machine cycles to executive PIC has virtually 40 instructions which are mostly 4 cycles instructions AVRs have 140 instructions whcih are mostly 1 cycle based if we come to speed factor: 1 machine cycle in 8051 (normal) divides 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 MHz i,e = 12 Million instructions per second so you can clearly see the that AVR executes more no:of instructions per given time and can be considered as the instant(prenominal) among the 3. also 8051 consumes more power than the other two and PIC consumes the least power. Both PIC and AVR are RISC based but their instruction Sets are entirely different. from Programming ( i,e piece tag ) point 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, order it on our website: Orderessay
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