SAK-C505L Infineon Technologies AG, SAK-C505L Datasheet - Page 20

• Manufacturer Part Number: SAK-C505L
• Description: 8-bit CMOS Microcontroller
• Manufacturer: Infineon Technologies AG

Multiple Datapointers
As a functional enhancement to the standard 8051 architecture, the C505L contains eight 16-bit
datapointers instead of only one datapointer. The instruction set uses just one of these datapointers
at a time. The selection of the actual datapointer is done in the special function register DPSEL.
Figure 9 illustrates the datapointer addressing mechanism.
Figure 9
External Data Memory Addressing using Multiple Datapointers
Data Sheet
DPSEL(92 )
DPSEL
-
.2
0
0
0
0
1
1
1
1
-
.1
0
0
1
1
0
0
1
1
-
H
-
.0
0
1
0
1
0
1
0
1
-
Selected
Data-
pointer
DPTR 0
DPTR 1
DPTR 2
DPTR 3
DPTR 4
DPTR 5
DPTR 6
DPTR 7
.2
.1
.0
DPH(83 )
H
18
DPL(82 )
H
DPTR7
DPTR0
External Data Memory
MCD00779
C505L
06.99