SAF-C505CA-LM Infineon Technologies, SAF-C505CA-LM Datasheet - Page 20

• Manufacturer Part Number: SAF-C505CA-LM
• Description: IC, 8BIT MCU ROM/ROMLESS, SMD
• Manufacturer: Infineon Technologies

Specifications of SAF-C505CA-LM

• No. Of I/o's: 34
• Ram Memory Size: 256Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 4
• Digital Ic Case Style: MQFP
• Supply Voltage: RoHS Compliant
• Core Size: 8bit
• Oscillator Type: External, Internal
• Controller Family/series: C500
• Peripherals: ADC
• Rohs Compliant: Yes

Multiple Datapointers
As a functional enhancement to the standard 8051 architecture, the C505 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 regsiter DPSEL.
Figure 8
Figure 8
External Data Memory Addressing using Multiple Datapointers
Data Sheet
DPSEL(92 )
DPSEL
-
.2
0
0
0
0
1
1
1
1
-
illustrates the datapointer addressing mechanism.
.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
16
DPL(82 )
H
C505/C505C/C505A/C505CA
DPTR7
DPTR0
External Data Memory
MCD00779
12.00