NXP Semiconductors MC9S12G - Page 1076

192 KByte Flash Module (S12FTMRG192K2V1)
MC9S12G Family Reference Manual Rev.1.27
1078 NXP Semiconductors
The FPROT register, described in Section 30.3.2.9, can be set to protect regions in the Flash memory from
accidental program or erase. 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 30-4.
Table 30-3. P-Flash Memory Addressing
Global Address
Size
(Bytes)
Description
0x1_0000 – 0x3_FFFF 192 K
P-Flash Block
Contains Flash Configuration Field
(see Table 30-4).
Table 30-4. Flash Configuration Field
Global Address
Size
(Bytes)
Description
0x3_FF00-0x3_FF07 8
Backdoor Comparison Key
Refer to Section 30.4.6.11, “Verify Backdoor Access Key Command,” and
Section 30.5.1, “Unsecuring the MCU using Backdoor Key Access”
0x3_FF08-0x3_FF0B
1
1
0x3FF08-0x3_FF0F form a Flash phrase and must be programmed in a single command write sequence. Each byte in
the 0x3_FF08 - 0x3_FF0B reserved field should be programmed to 0xFF.
4 Reserved
0x3_FF0C
1
1
P-Flash Protection byte
.
Refer to Section 30.3.2.9, “P-Flash Protection Register (FPROT)”
0x3_FF0D
1
1
EEPROM Protection byte
.
Refer to Section 30.3.2.10, “EEPROM Protection Register (EEPROT)”
0x3_FF0E
1
1
Flash Nonvolatile byte
Refer to Section 30.3.2.16, “Flash Option Register (FOPT)”
0x3_FF0F
1
1
Flash Security byte
Refer to Section 30.3.2.2, “Flash Security Register (FSEC)”