C509-L_97 Datasheet, PDF (242/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Bootstrap Loader
C509-L
Info Block Byte
Description
ID byte #1 - #4
Four ID bytes which mark the external FLASH memory
sector as programmed.
startaddress (high, low)
The start address, where the custom program starts.
blocklength (high, low)
The length of the memory block, which is filled with the
custom program code.
checksum #1, #2
Two checksum bytes for the external FLASH memory
block
memory area for custom software The area for the custom program starting at C00AH in
sector A and 600AH in sector B
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
10-4
1997-10-01