Freescale Semiconductor MC9S12ZVHL32, Reference Manual

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Chapter 21 64 KB Flash Module (S12ZFTMRZ64K2KV2)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
692 Freescale Semiconductor
memory, can be activated for protection. The Flash memory addresses covered by these protectable
regions are shown in the P-Flash memory map. The higher address region is mainly targeted to hold the
boot loader code since it covers the vector space. Default protection settings as well as security information
that allows the MCU to restrict access to the Flash module are stored in the Flash configuration field as
described in
Table 21-4 .
Table 21-4. Flash Configuration Field
Global Address
Size
(Bytes)
Description
0xFF_FE00-0xFF_FE07 8
Backdoor Comparison Key
Refer to
Section 21.4.7.11, “Verify Backdoor Access Key Command ,” and
Section 21.5.1, “Unsecuring the MCU using Backdoor Key Access ”
0xFF_FE08-0xFF_FE09
1
2
Protection Override Comparison Key. Refer to Section 21.4.7.17, “Protection
Override Command ”
0xFF_FE0A-
0xFF_FE0B
(1)
1. 0xFF_FE08-0xFF_FE0F form a Flash phrase and must be programmed in a single command write sequence. Each byte
in the 0xFF_FE0A - 0xFF_FE0B reserved field should be programmed to 0xFF.
2
Reserved
0xFF_FE0C
1
1
P-Flash Protection byte
.
Refer to Section 21.3.2.9, “P-Flash Protection Register (FPROT)”
0xFF_FE0D
1
1
EEPROM Protection byte
.
Refer to Section 21.3.2.10, “EEPROM Protection Register (DFPROT)”
0xFF_FE0E
1
1
Flash Nonvolatile byte
Refer to
Section 21.3.2.11, “Flash Option Register (FOPT)”
0xFF_FE0F
1
1
Flash Security byte
Refer to
Section 21.3.2.2, “Flash Security Register (FSEC)”