basic memory organizion at 8051

in 8051 you only have data memory no idata as it only have 128 bytes of ram. Whereas if you go for 8052 architecture where you have 256 bytes or ram. lower 128 bytes are data and upper 128 bytes are idata.

Now the name data and idata differs in the way you can address them. idata can only be addressed indirectly i.e. using r0, r1 registers are pointers. e.g.
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