MC9S12C128V1 Datasheet, PDF (578/690 Pages) Freescale Semiconductor, Inc – MC9S12C Family MC9S12GC Family Reference Manual

Chapter 20 96 Kbyte Flash Module (S12FTS96KV1)
address 0x8000 to 0xBFFF to any physical 16K byte page in the Flash array memory.¹ The FPROT register
(see Section 20.3.2.5) can be set to globally protect the entire Flash array. Three separate areas, one starting
from the Flash array starting address (called lower) towards higher addresses, one growing downward from
the Flash array end address (called higher), and the remaining addresses, can be activated for protection.
The Flash array addresses covered by these protectable regions are shown in Figure 20-3Figure 20-4. The
higher address area is mainly targeted to hold the boot loader code since it covers the vector space. The
lower address area 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. 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 described in Table 20-1.
Flash Address
0xFF00–0xFF07
0xFF08–0xFF0C
0xFF0D
0xFF0E
0xFF0F
Table 20-1. Flash Configuration Field
Size
(bytes)
8
5
1
1
1
Description
Backdoor Key to unlock security
Reserved
Flash Protection byte
Refer to Section 20.3.2.5, “Flash Protection Register (FPROT)”
Reserved
Flash Security/Options byte
Refer to Section 20.3.2.2, “Flash Security Register (FSEC)”
1. By placing 0x3E/0x3F in the HCS12 Core PPAGE register, the bottom/top fixed 16 Kbyte pages can be seen twice in the MCU
memory map.
578
MC9S12C-Family / MC9S12GC-Family
Freescale Semiconductor
Rev 01.24