what is register banks in 8051?

Answer Posted / anya

The 8051 has an internal RAM of 128 bytes,a total of 32
locations of this internal RAM kept aside for the purpose of
general(working)registers. these 32 bytes are divided into 4
banks each bank has eight registers,R0-R7. these are also
addressed by 00 H to 1F H.They access by choosing a
particular bank(B-0,B-1,B-2,B-3)using D4 and D3 bits of
Program status word(SFR). Actually when power is given to
8051, Bank-0 is selected.

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