SAB-C509-LM SIEMENS [Siemens Semiconductor Group], SAB-C509-LM Datasheet - Page 18

• Manufacturer Part Number: SAB-C509-LM
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

C509-L
Normal Mode Configuration
The Normal Mode is the standard 8051 compatible operating mode of the C509-L. In this mode 64K
byte external code memory and 61K byte external SRAM as well as 3K byte internal data memory
(XRAM) are provided. If the is disabled (default after reset), totally 64K byte external data memory
are available. The Boot ROM is disabled. The external program memory is controlled by the PSEN/
RDF signal. Read and write accesses to the external data memory are controlled by the RD and WR
pins of port 3.
Figure 6
Locations of Code- and Data Memory in Normal Mode
Semiconductor Group
17
09.96