In some systems the CPU and bus timing is a limit to the highest and sometimes the lowest CPU clock frequency, so the clock needs to be stable enough to guarantee timing requirements are met according to the design and the specification.
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Because that was what was selected by the designers to make it easy to set the UART BAUD rate selections.
Modern 8051 replacements run faster.
Intel
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65536 bytes, because the 8051 family has a 16 bit external address buss.
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.
The 8051 is a microcontroller, not a microprocessor. To add or subtract, use the ADD or SUBB opcodes.