MC9S08DN60F1CLF datasheet(59/356 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

4.5.11.3

Flash and EEPROM Conﬁguration Register (FCNFG)

4.5.11.4

Flash and EEPROM Protection Register (FPROT and NVPROT)

The FPROT register deﬁnes which Flash and EEPROM sectors are protected against program and erase

operations.

During the reset sequence, the FPROT register is loaded from the nonvolatile location NVPROT. To

change the protection that will be loaded during the reset sequence, the sector containing NVPROT must

be unprotected and erased, then NVPROT can be reprogrammed.

FPROT bits are readable at any time and writable as long as the size of the protected region is being

increased. Any write to FPROT that attempts to decrease the size of the protected memory will be ignored.

Trying to alter data in any protected area will result in a protection violation error and the FPVIOL ﬂag

will be set in the FSTAT register. Mass erase is not possible if any one of the sectors is protected.

Figure 4-8. Flash and EEPROM Protection Register (FPROT)

76543210

EPGSEL

KEYACC

Reserved1

1 User must write a 1 to this bit. Failing to do so may result in unexpected behavior.

0001

Reset

00010001

= Unimplemented or Reserved

Figure 4-7. Flash Conﬁguration Register (FCNFG)

Table 4-10. FCNFG Register Field Descriptions

Field

Description

EPGSEL

EEPROM Page Select — This bit selects which EEPROM page is accessed in the memory map.

0 Page 0 is in foreground of memory map. Page 1 is in background and can not be accessed.

1 Page 1 is in foreground of memory map. Page 0 is in background and can not be accessed.

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 4.5.9, “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.

76543210

EPS1

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

FPS1

Reset

This register is loaded from nonvolatile location NVPROT during reset.

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