MC9S08DN60F1CLF datasheet(58/356 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

76543210

KEYEN

FNORED

EPGMOD

SEC

Reset

= Unimplemented or Reserved

F = loaded from nonvolatile location NVOPT during reset

Figure 4-6. Flash and EEPROM Options Register (FOPT)

Table 4-8. FOPT Register Field Descriptions

Field

Description

KEYEN

Backdoor Key Mechanism Enable — When this bit is 0, the backdoor key mechanism cannot be used to

disengage security. The backdoor key mechanism is accessible only from user (secured) ﬁrmware. BDM

commands cannot be used to write key comparison values that would unlock the backdoor key. For more detailed

information about the backdoor key mechanism, refer to Section 4.5.9, “Security.”

0 No backdoor key access allowed.

1 If user ﬁrmware writes an 8-byte value that matches the nonvolatile backdoor key (NVBACKKEY through

NVBACKKEY+7 in that order), security is temporarily disengaged until the next MCU reset.

FNORED

Vector Redirection Disable — When this bit is 1, then vector redirection is disabled.

0 Vector redirection enabled.

1 Vector redirection disabled.

EPGMOD

EEPROM Sector Mode — When this bit is 0, each sector is split into two pages (4-byte mode). When this bit is

1, each sector is in a single page (8-byte mode).

0 Half of each EEPROM sector is in Page 0 and the other half is in Page 1.

1 Each sector is in a single page.

1:0

SEC

Security State Code — This 2-bit ﬁeld determines the security state of the MCU as shown in Table 4-9. When

the MCU is secure, the contents of RAM, EEPROM and Flash memory cannot be accessed by instructions from

any unsecured source including the background debug interface. SEC changes to 1:0 after successful backdoor

key entry or a successful blank check of Flash. For more detailed information about security, refer to Section

4.5.9, “Security.”

Table 4-9. Security States1

1 SEC changes to 1:0 after successful backdoor key entry

or a successful blank check of Flash.

SEC[1:0]

Description

0:0

secure

0:1

secure

1:0

unsecured

1:1

secure

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