Cfmsec Field Descriptions - Motorola ColdFire MCF5281 User Manual

Bits Name
31 KEYEN
30 SECSTAT
29–16 —
15–0 SEC[15:0]
The security features of the CFM are described in Section 6.5, "Flash Security Operation."
MOTOROLA
Table 6-6. CFMSEC Field Descriptions
Enable back door key to security
1 Back door to Flash is enabled.
0 Back door to Flash is disabled.
Flash security status
1 Flash security is enabled
0 Flash security is disabled
Reserved. Should be cleared.
Security field. The SEC bits define the security state of the device; see below.
SEC[15:0]
0x4AC8
All other combinations
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.
Chapter 6. ColdFire Flash Module (CFM)
Description
Description
Flash secured
Flash unsecured
Memory Map
1
6-11