Felix Diza wrote:

QUOTE ----
8052 has havard architecture, thus internal memory has it´s own memory map from 0 to 127 in 8051 and 0 to 255 in 8052 device
UNQUOTE ----

I don't see any relation between Harvard architecture and the 1/8 or 1/4 kByte memory you mention. And what about devices having several kbytes of memory on-chip?

Taking a look at the tutorial pages may provide a (better) answer to the question ..