C509-L 查看數據表（PDF） - Siemens AG

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C509-L

8-Bit CMOS Microcontroller

Siemens AG 

C509-L

Programming Mode Configuration

The External Programming Mode is implemented for the in-circuit programming of external 5V-only

FLASH EPROMs. Similar as in the XRAM mode, the Boot ROM, the XRAM, and the external data

memory (SRAM) are mapped into the code memory area, while the external FLASH memory is

mapped into the external data memory area. Additionally to the XRAM mode, the FLASH memory

can also be written through external data memory accesses (MOVX instructions). External program

memory fetches from the SRAM are controlled by the P3.7/RD/PSENX pin. External data memory

read/write accesses from/to the ROM/EPROM are controlled by the PSEN/RDF and P6.3/WRF pin.

Figure 9

Locations of Code- and Data Memory in Programming Mode

Semiconductor Group

20

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