C509-L_97 Datasheet, PDF (270/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Bootstrap Loader
C509-L
The bootstrap loader is sequentially working through the three phases. The addresses given in
table 10-6 allow the customer to step into the bootstrap loader in several phases.
Table 10-6
Further Bootstrap Loader Reference Addresses
Address Function
0000H
0026H
Main
LookFLASH1
0035H LookFLASH2
0044H PrepSerial
004AH
004FH
WaitHeader
Header
0054H Jump2Mode
Description
Start the complete bootstrap loader
Phase I: Search for a functional custom program in the ext. FLASH
memory sectors A and B
Phase I: Search for a functional custom program only in the ext.
FLASH memory sector B
Phase II: Initialize the serial interface 0 and synchronize it to the host
baud rate
Phase III: Wait for the header to select the operating mode
Phase III: Check the header block information and save it in specific
registers
Phase III: Select and activate the operating mode given in register R1
Semiconductor Group
10-32
1997-10-01