Motorola ColdFire MCF5281 - Manual (Page 122)

ColdFire Flash Module (CFM)
6-10 Freescale Semiconductor
NOTE
CFMCLKD must be written with an appropriate value before programming
or erasing the Flash array. Refer to
Section 6.4.3.1, “Setting the CFMCLKD
Register .”
6.3.4.3 CFM Security Register (CFMSEC)
The CFMSEC controls the Flash security features.
NOTE
Enabling Flash security will disable BDM communications.
NOTE
When Flash security is enabled, the chip will boot in single-chip mode
regardless of the external reset configuration.
31 30 29 16
Field KEYEN SECSTAT —
Reset See Note
R/W R
15 0
Field SEC
Reset See Note
R/W R
Address IPSBAR + 0x1D_0008
Note: The SECSTAT bit reset value is determined by the security state of the Flash. All other bits in the register
are loaded at reset from the Flash Security longword stored at the array base address + 0x0000_0414.
Figure 6-6. CFM Security Register (CFMSEC)
Table 6-6. CFMSEC Field Descriptions
Bits Name Description
31 KEYEN Enable back door key to security
1 Back door to Flash is enabled.
0 Back door to Flash is disabled.
30 SECSTAT Flash security status
1 Flash security is enabled
0 Flash security is disabled
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3