C515A_9708 Datasheet, PDF (25/182 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Memory Organization
C515A
Port 0
Address/Data
XPAGE
Write to Port 2
XRAM
Port 2
Page Address
MCB02112
Figure 3-2
Write Page Address to Port 2
“MOV P2,pageaddress” will write the page address to port 2 and the XPAGE-Register.
When external RAM is to be accessed in the XRAM address range, the XRAM has to be disabled.
When additional external RAM is to be addressed in an address range < FC00H, the XRAM may
remain enabled and there is no need to overwrite XPAGE by a second move.
Semiconductor Group
3-6
1997-08-01