Sebastian,

I am not aware of a "Register Pointer" per se, Registers in an 8051 are most commonly used as "direct" resources, for instance, "mov a,r1".

Registers r0/r1 have the ability to indirectly access (being used as pointers) the scratch ram internal to the 8051 addressing 0 thru FFH. The first 32 locations of this internal ram being accessable as 4 banks of 8 registers. That is .. r0 is location 00H when reg bank 0 (as programmed into the PSW). when reg bank1 is selected r0 is location 08H, location 10H/bank2; location16H/bank3.

regards,
p