C509-L_97 Datasheet, PDF (66/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

External Bus Interface
C509-L
Port 0
Address/Data
XPAGE
Write to XPAGE
Port 2
XRAM
Address/
I/O-Data
MCB02113
Figure 4-5
Write Page Address to XPAGE
The page address is only written to the XPAGE register. Port 2 is available for addresses or I/O
data. See figure 4-6 to see what happens when Port 2 is used as I/O-Port.
Semiconductor Group
4-14
1997-10-01