HCS08 datasheet(61/374 Pages) NXP

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Chapter 4 Memory

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

SEC01:SEC00 changes to 1:0 after successful backdoor key entry or a successful blank check of flash.

4.7.3

Flash Configuration Register (FCNFG)

Bits 7 through 5 may be read or written at any time. Bits 4 through 0 always read 0 and cannot be written.

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

commands can write to FPROT.

Table 4-9. Security States

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

FPS7

FPS6

FPS5

FPS4

FPS3

FPS2

FPS1

FPDIS

(1)

Reset

This register is loaded from nonvolatile location NVPROT during reset.

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

Figure 4-8. Flash Protection Register (FPROT)

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