PXD20RM Datasheet, PDF (179/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Table 6-1. Hardware configuration to select boot mode
FAB
ABS
Standby-RAM
Boot Flag
Boot ID
Boot Mode
1
0
0
—
LINFlex
1
1
0
—
FlexCAN
0
-
0
valid
SC (Single Chip)
0
-
0
not found
Static Mode
-
-
1
-
From Backup RAM (0x40000000)¹
1 _{After the device exits standby, it boots from Backup RAM if the Standby-RAM boot flag is set. If this flag is not set, the device}
boots internally (SC) or using the BAM depending on the state of the FABM and ABS pins.
6.5.2 Reset Configuration Half Word Source (RCHW)
PXD20 flash memory is partitioned into boot sectors shown in Table 6-3.
Each boot sector contains the Reset Configuration Half-Word (RCHW) at offset 0x00.
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
R 0 0 0 0 0 0 0 VLE
BOOT_ID
W
RESET: ₀
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-2. Reset Configuration Half Word (RCHW)
Table 6-2. RCHW field descriptions
Field
Description
VLE
BOOT_ID
Selects the VLE or Book E instruction set at application start address.
0 Selects the classic PowerPC instruction set
1 Selects the VLE instruction set
Is valid if its value is 0x5A, then the sector is considered bootable
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
6-3
Preliminary—Subject to Change Without Notice