XBee®/XBee‐PRO® ZB SMT RF Modules
XBee Programmable Bootloader
Overview
The XBee Programmable module is equipped with a Freescale MC9S08QE32 application processor. This
application processor comes with a supplied bootloader. This section describes how to interface the
customer's application code running on this processor to the XBee Programmable module's supplied
bootloader.
The first section discusses how to initiate firmware updates using the supplied bootloader for wired and over-
the-air updates.
Bootloader Software Specifics
Memory Layout
The figure below shows the memory map for the MC9S08QE32 application processor.
The supplied bootloader occupies the bottom pages of the flash from 0xF200 to 0xFFFF. Application
code cannot write to this space.
The application code can exist in Flash from address 0x8400 to 0xF1BC. 1k of Flash from 0x8000 to
0x83FF is reserved for Non Volatile Application Data that will not be erased by the bootloader during a
flash update.
A portion of RAM is accessible by both the application and the bootloader. Specifically, there is a
shared data region used by both the application and the bootloader that is located at RAM address
0x200 to 0x215. Application code should not write anything to AppResetCause or BLResetCause unless
informing the bootloader of the impending reset reason.
© 2010 Digi International, Inc.
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