C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 253

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

10.4.1.1 Header Block Definition
The header block from the host, which contains the mode number and additional data to start the
selected operating mode, is a normal transfer block with the block type HEADER (00 H ) and a fixed
length of eight bytes (including the attached checksum of the transfer block). Figure 10-10 shows
the general structure of this header block is shown below.
Figure 10-10
Structure of the HEADER Block
Semiconductor Group
Format Item
mode
startaddress
XX H
Description
This field contains the number of the operating mode:
00 H Load custom program into the XRAM memory.
01 H Jump to the XRAM memory at the specified
02 H Calculate the checksum of a specified part of the
03 H Jump to the FLASH memory at the specified
This 16-bit address defines the start address either in
XRAM or in ext. FLASH memory. The first byte to be
transmitted is the high order byte of the 16-bit address.
These bytes have a different meaning depending on the
mode byte of a header block. The detailed definition of
these bytes is given in figures 10-11, 10-18, 10-21, and
10-24.
address startaddress .
external FLASH memory which is defined by
startaddress and datalength.
address startaddress.
10-15
Bootstrap Loader
1997-10-01
C509-L