C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 242

• Manufacturer Part Number: C509-L_97
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 10-3
The Structure of the FLASH Memory Info Block
The info block starts with a fixed sequence of four identification bytes ( ID bytes ). They mark the
corresponding memory sector as custom programmed. If the ID bytes are not present at the
beginning of the info block, the bootstrap loader assumes, that the corresponding sector is not
custom programmed.
Semiconductor Group
Info Block Byte
ID byte #1 - #4
startaddress (high, low)
blocklength (high, low)
checksum #1, #2
memory area for custom software The area for the custom program starting at C00A H in
Description
Four ID bytes which mark the external FLASH memory
sector as programmed.
The start address, where the custom program starts.
The length of the memory block, which is filled with the
custom program code.
Two checksum bytes for the external FLASH memory
block
sector A and 600A H in sector B
10-4
Bootstrap Loader
1997-10-01
C509-L