C515C_9711 Datasheet, PDF (29/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Memory Organization
C515C
Port 0
Write to
Port 2
XPAGE
Port 2
XRAM
CAN-Controller
Address/Data
Page Address
MCS02761
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/CAN controller address range (F700H -
FFFFH), the XRAM/CAN controller has to be disabled. When additional external RAM is to be
addressed in an address range < F700H, the XRAM/CAN controller may remain enabled and there
is no need to overwrite XPAGE by a second move.
Semiconductor Group
3-6
1997-11-01