SAB80C515A-5 SIEMENS [Siemens Semiconductor Group], SAB80C515A-5 Datasheet - Page 16
![no-image](/images/no-image-200.jpg)
SAB80C515A-5
Manufacturer Part Number
SAB80C515A-5
Description
8-Bit CMOS Single-Chip Microcontroller Family
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.SAB80C515A-5.pdf
(108 pages)
- Current page: 16 of 108
- Download datasheet (2Mb)
Accesses to XRAM using the Registers R0/R1
The 8051 architecture provides also instructions for accesses to external data memory range which
use only an 8-bit address (indirect addressing with registers R0 or R1). The instructions are:
In application systems, either a real 8-bit bus (with 8-bit address) is used or Port 2 serves as page
register which selects pages of 256-Byte. However, the distinction, whether Port 2 is used as
general purpose I/0 or as "page address" is made by the external system design. From the device’s
point of view it cannot be decided whether the Port 2 data is used externally as address or as I/0
data!
Hence, a special page register is implemented into the SAB 80C515A to provide the possibility of
accessing the XRAM also with the MOVX @Ri instructions, i.e. XPAGE serves the same function
for the XRAM as Port 2 for external data memory.
Special Function Register XPAGE
The reset value of XPAGE is 00 H .
XPAGE can be set and read by software.
Figures 3-2 to 3-4 show the dependencies of XPAGE- and Port 2 - addressing in order to explain
the differences in accessing XRAM, ext. RAM or what is to do when Port 2 is used as an I/O-port.
Semiconductor Group
Bit No.
Addr.91H
MOVX
MOVX
MSB
7
A, @ Ri
@Ri, A
6
(Read)
(Write)
5
4
3-9
3
2
Memory Organization
1
LSB
0
XPAGE
Related parts for SAB80C515A-5
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![S80C32-12](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
Intel 80C32 - Siemens SAB-C501, Nearest Equivalent Replacement
Manufacturer:
Siemens Semiconductor Group
![BAT14-033](/images/no-image3.png)
Part Number:
Description:
HiRel Silicon Schottky Diode (HiRel Discrete and Microwave Semiconductor Medium barrier diodes for detector and mixer applications)
Manufacturer:
SIEMENS [Siemens Semiconductor Group]
Datasheet:
![BXY43-P1](/images/no-image3.png)
Part Number:
Description:
HiRel Silicon PIN Diode (HiRel Discrete and Microwave Semiconductor Current controlled RF resistor for RF attenuators and switches)
Manufacturer:
SIEMENS [Siemens Semiconductor Group]
Datasheet:
![BXY44-T1](/images/no-image3.png)
Part Number:
Description:
HiRel Silicon PIN Diode (HiRel Discrete and Microwave Semiconductor Current controlled RF resistor for RF attenuators and switches)
Manufacturer:
SIEMENS [Siemens Semiconductor Group]
Datasheet:
![IRL80](/images/no-image3.png)
Part Number:
Description:
GaAs-Infrarot-Sendediode GaAs Infrared Emitter
Manufacturer:
SIEMENS [Siemens Semiconductor Group]
Datasheet:
![IRL81](/images/no-image3.png)
Part Number:
Description:
GaAlAs-Infrarot-Sendediode GaAlAs Infrared Emitter
Manufacturer:
SIEMENS [Siemens Semiconductor Group]
Datasheet:
![BSM50GB100D](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
IGBT MODULE
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![BSM181R](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
SIMOPAC Module (Power module Single switch N channel Enhancement mode)
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![BSM254F](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
(BSMxxx) TRANSISTOR
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![BSM111AR](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
SIMOPAC Module (Power module Single switch N channel Enhancement mode)
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![BUZ48](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
main ratings
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![TDA4716C](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![DL440M](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
Manufacturer:
Siemens Semiconductor Group
Datasheet:
![SDA5255](/images/manufacturer_photos/0/6/607/siemens_semiconductor_group_tmb.jpg)
Part Number:
Description:
Manufacturer:
Siemens Semiconductor Group
Datasheet: