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ColdFire Flash Module (CFM)
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
18-10 Freescale Semiconductor
The CFMSEC register is loaded from the flash configuration field in the flash block at offset 0x0414
during the reset sequence, indicated by F in Figure 18-6.
The CFM flash security operation is described in Section 18.4.3, “Flash Security Operation”.
18.3.3.4 CFMPROT — CFM Protection Register
The CFMPROT register defines which flash logical sectors are protected against program and erase
operations.
Figure 18-7. CFM Protection Register (CFMPROT)
All CFMPROT register bits are readable and only writable when LOCK=0.
The flash memory is divided into logical sectors for the purpose of data protection using the CFMPROT
register. The flash memory consists of 32 4kByte sectors as shown in <f-helvetica><st-bold>Figure 18-8..
29-16 Reserved, should read 0
15 - 0
SEC
Flash memory security bits
The SEC bits define the security state of the MCU as shown in Ta ble 1 8-7 , which defines the single code
that enables the security feature in the CFM
Table 18-7. CFM Security States
SEC[15:0] Description
0x4AC8
1
1
This value was chosen because it represents the ColdFire HALT instruction, making
it unlikely that a user compiled code accidentally programmed at the security
configuration field location would unintentionally secure the flash memory.
Flash Memory Secured
All other combinations Flash Memory Unsecured
IPSBAR
Offset: 0x1D_0010 (CFMPROT)
Access: User read/write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
PROTECT
W
Reset F
1
1
Reset state loaded from flash configuration field during reset.
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
PROTECT
W
Reset F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
F
1
Table 18-6. CFMSEC Field Descriptions
Field Description