MC9S08DZ96F2CLL datasheet(80/458 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

4.6.11.4

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 4-17. FLASH and EEPROM Protection Register (FPROT)

76543210

EPS

FPS

FPOP

Reset

FFFFFFFF

Table 4-18. FPROT Register Field Descriptions

Field

Description

7:6

EPS

EEPROM Protect Select Bits — This 2-bit ﬁeld determines the protected EEPROM locations that cannot be

erased or programmed. See Table 4-19.

5:1

FPS

FLASH Protect Select Bits — With FPOP set, this 5-bit ﬁeld determines the protected FLASH locations that

cannot be erased or programmed. SeeTable 4-20.

FPOP

FLASH Protection Open

0 Flash is fully protected.

1 Flash protected address range determined by FPS bits.

Table 4-19. EEPROM Block Protection

EPS

Protected Address Range

Protected Size

0x3

No protection

0 bytes

0x2

3FF0 - 3FFF

32 bytes

0x1

3FE0 - 3FFF

64 bytes

0x0

3FC0–3FFF

128 bytes

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