HCS08 datasheet(58/316 Pages) NXP

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Chapter 4 Memory

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

4.7.3

FLASH Configuration Register (FCNFG)

4.7.4

FLASH Protection Register (FPROT and NVPROT)

During reset, the contents of the nonvolatile location NVPROT is copied from FLASH into FPROT. This

Figure 4-8. FLASH Protection Register (FPROT)

Table 4-9. Security States1

1 SEC01:SEC00 changes to 1:0 after successful backdoor

key entry or a successful blank check of FLASH.

SEC01:SEC00

Description

0:0

secure

0:1

secure

1:0

unsecured

1:1

secure

321

KEYACC

000

Reset

000

= Unimplemented or Reserved

Figure 4-7. FLASH Configuration Register (FCNFG)

Table 4-10. FCNFG Register Field Descriptions

Field

Description

KEYACC

Enable Writing of Access Key — This bit enables writing of the backdoor comparison key. For more detailed

information about the backdoor key mechanism, refer to Section 4.6, “Security.”

0 Writes to 0xFFB0–0xFFB7 are interpreted as the start of a FLASH programming or erase command.

1 Writes to NVBACKKEY (0xFFB0–0xFFB7) are interpreted as comparison key writes.

321

FPS(1)

1 Background commands can be used to change the contents of these bits in FPROT.

FPDIS(1)

Reset

This register is loaded from nonvolatile location NVPROT during reset.

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