SAB80C515A-5 Datasheet, PDF (17/108 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller Family

Memory Organization
Figure 3-2
Write Page Address to Port 2
MOV P2, pageaddress will write the page address to Port 2 and XPAGE-Register.
When external RAM is to be accessed in the XRAM address range (F800H - FFFFH) XRAM has to
be disabled. When additional external RAM is to be addressed in an address range ≤ XRAM
(F800H) XRAM may remain being enabled and there is no need to overwrite XPAGE by a second
move.
Semiconductor Group
3-10