C508_01 Datasheet, PDF (30/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
Memory Organization
Port 0
Address/Data
XPAGE
Write to Port 2
XRAM
Port 2
Page Address
MCB02112
Figure 3-2 Write Page Address to Port 2
Moving the page address to Port 2 by using either the immediate addressing instruction
(MOV P2, #pageaddress) or the direct addressing instruction (MOV P2, PAL; where
‘PAL’ is the internal RAM location containing the page address) will write the page
address to Port 2 and also to the XPAGE-Register.
When external RAM is to be accessed in the XRAM address range, the XRAM must be
disabled. When the additional external RAM is to be addressed in an address range
0000_H to FC00_H, the XRAM may remain enabled.
User’s Manual
3-6
2001-05