Motorola ColdFire MCF5281 - Manual (Page 123)

ColdFire Flash Module (CFM)
Freescale Semiconductor 6-11
The security features of the CFM are described in Section 6.5, “Flash Security Operation .”
29–16 — Reserved. Should be cleared.
15–0 SEC[15:0] Security field. The SEC bits define the security state of the device; see below.
Table 6-6. CFMSEC Field Descriptions
Bits Name Description
SEC[15:0] Description
0x4AC8 Flash secured
1
1 The 0x4AC8 value was chosen because it represents the ColdFire Halt
instruction, making it unlikely that compiled code accidentally programmed
at the security longword in the Flash configuration field location would
unintentionally secure the device.
All other combinations Flash unsecured
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3