mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 533

• Manufacturer Part Number: mc9s12q128
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

19.3
This section describes the
19.3.1
The
addresses between
HCS12 Core PPAGE register is used to map the logical
0xBFFF to
19.3.2.5) can be set to globally protect the entire Flash
Flash array starting address (called lower) towards higher addresses,
Flash array end address
Flash array addresses covered by these protectable regions are shown in Figure 19-2.
area is mainly targeted to hold the boot loader code since it covers the vector space.
can be used for EEPROM emulation in an MCU without an EEPROM module since it can be left
unprotected while the remaining addresses are protected from program or erase.
settings as well as security information that allows the MCU to restrict access to the Flash module are
stored in the Flash configuration field described in
1. By placing 0x3E/0x3F in the HCS12 Core PPAGE register, the
Freescale Semiconductor
memory map.
FTS96K
0xFF08–0xFF0C
0xFF00–0xFF07
Memory Map and Registers
Flash Address
any
Module Memory Map
0xFF0D
0xFF0E
0xFF0F
memory map is shown in
physical 16K byte page in the Flash array memory.
0x4000
(called higher), and the remaining addresses, can be activated for
FTS96K
(bytes)
and
Size
8
5
1
1
1
0xFFFF, which corresponds to three 16 Kbyte
Table 19-1. Flash Configuration Field
memory map and registers.
Backdoor Key to unlock security
Reserved
Flash Protection byte
Refer to
Reserved
Flash Security/Options byte
Refer to
Figure
Section 19.3.2.5, “Flash Protection Register (FPROT)”
Section 19.3.2.2, “Flash Security Register (FSEC)”
MC9S12Q128
19-2. The HCS12 architecture places the Flash array
Rev 1.09
Table
bottom/top fixed
array. Three separate areas, one starting from the
middle
19-1.
Description
page ranging from address 0x8000 to
Chapter 19 96 Kbyte Flash Module (S12FTS96KV1)
1
16 Kbyte
The FPROT register (see
one growing downward from the
pages
pages. The content of the
can be seen twice in the MCU
Default protection
The lower address area
The higher address
protection.
Section
The
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