MC9S08DN60F1CLF datasheet(46/356 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

Provided the key enable (KEYEN) bit is 1, the 8-byte comparison key can be used to temporarily

disengage memory security. This key mechanism can be accessed only through user code running in secure

memory. (A security key cannot be entered directly through background debug commands.) This security

key can be disabled completely by programming the KEYEN bit to 0. If the security key is disabled, the

only way to disengage security is by mass erasing the Flash if needed (normally through the background

debug interface) and verifying that Flash is blank. To avoid returning to secure mode after the next reset,

program the security bits (SEC) to the unsecured state (1:0).

Table 4-4. Nonvolatile Register Summary

Address

Bit 7

654321

Bit 0

0xFFAE

Reserved for

storage of FTRIM

FTRIM

0xFFAF

Res. for storage of

MCGTRM

TRIM

0xFFB0–

0xFFB7

NVBACKKEY

8-Byte Comparison Key

0xFFB8–

0xFFBC

Reserved

—

0xFFBD

NVPROT

EPS

FPS

0xFFBE

Reserved

—

0xFFBF

NVOPT

KEYEN

FNORED

EPGMOD

SEC

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