mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 226
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mc9s12xf512
Manufacturer Part Number
mc9s12xf512
Description
S12x Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XF512.pdf
(1306 pages)
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Chapter 8 256 KByte Flash Module (S12XFTM256K2XFV1)
8.3
This section describes the memory map and registers for the Flash module. Read data from unimplemented
memory space in the Flash module is undefined. Write access to unimplemented or reserved memory space
in the Flash module will be ignored by the Flash module.
8.3.1
The S12X architecture places the P-Flash memory between global addresses 0x78_0000 and 0x7F_FFFF
as shown in
The FPROT register, described in
accidental program or erase. Three separate memory regions, one growing upward from global address
0x7F_8000 in the Flash memory (called the lower region), one growing downward from global address
0x7F_FFFF in the Flash memory (called the higher region), and the remaining addresses in the Flash
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
226
0x7F_FF00 – 0x7F_FF07
8-3.
Global Address
0x7F_FF0B
0x7F_FF08 –
0x7F_FF0C
0x7F_FF0D
0x7F_FF0E
Memory Map and Registers
Module Memory Map
Table
(2)
0x7A_0000 – 0x7D_FFFF
0x7E_0000 – 0x7F_FFFF
0x78_0000 – 0x79_FFFF
2
2
2
8-2. The P-Flash memory map is shown in
Global Address
(Bytes)
Size
8
4
1
1
1
MC9S12XF - Family Reference Manual, Rev.1.19
Table 8-2. P-Flash Memory Addressing
Section
Table 8-3. Flash Configuration Field
Backdoor Comparison Key
Refer to
Section 8.5.1, “Unsecuring the MCU using Backdoor Key
Reserved
P-Flash Protection byte
Refer to
EEE Protection byte
Refer to
Flash Nonvolatile byte
Refer to
8.3.2.9, can be set to protect regions in the Flash memory from
(Bytes)
128 K
256 K
128 K
Section 8.4.2.11, “Verify Backdoor Access Key
Section 8.3.2.9, “P-Flash Protection Register (FPROT)”
Section 8.3.2.10, “EEE Protection Register (EPROT)”
Section 8.3.2.14, “Flash Option Register (FOPT)”
Size
P-Flash Block 0
Contains Flash Configuration Field
(see
No P-Flash Memory
P-Flash Block 1
Table
.
8-3)
Figure
Description
Description
8-2.
(1)
Command,” and
Access”
Freescale Semiconductor
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