PXS20RM Datasheet, PDF (131/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Device Boot Modes
....
5^th loc
apps space
Boot information
apps space
4^th loc
3^rd loc
2^nd loc
$0000 0000
(1^st location)
Boot information
apps space
Boot information
apps space
Boot information
apps space
Boot information
$0000 000C
$0000 0008
$0000 0004
$0000 0000
Application
Application
Application start address
RCHW
Figure 5-1. Flash partitioning and RCHW search
5.3.2 Reset Configuration Half-Word
Each boot sector in the flash memory contains at offset 0x00 the Reset Configuration Half-Word (RCHW).
If the RCHW field BOOT_ID holds the value 0x5A then the sector is considered bootable. In addition
there is a flag which indicates that the code is Book E or VLE code. This flag should be set to match the
executable image. All other bits are reserved.
(No BAM code execution in this case, and BAM code will not be visible unless the device is in SBL
mode.)
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
5-3