Datasheet

Default protection settings as well as security information that allows the MCU to restrict

access to the flash module are stored in the flash configuration field as described in the

table below.

Table 4-11. Flash configuration field

Global address Size (Bytes) Description

0xFF70 — 0xFF77

Backdoor comparison key. See Verify backdoor access key command and

Unsecuring the MCU using backdoor key access.

0xFF78 — 0xFF7B 4 Reserved

0xFF7C

1 Flash protection byte

0xFF7D

1 EEPROM protection byte

0xFF7E

1 Flash nonvolatile byte

0xFF7F

1 Flash security byte

1. 0xFF78–0xFF7F for a flash phrase and must be programmed in a single command write sequence. Each byte in the

0xFF78-0xFF7B reserved field must be programmed to 0xFF.

The flash and EEPROM module provides protection to the MCU. During the reset

sequence, the FPROT register is loaded with the contents of the flash protection byte in

the flash configuration field at global address 0xFF7C in flash memory. The protection

functions depend on the configuration of bit settings in FPORT register.

Table 4-12. Flash protection function

FPOPEN FPHDIS FPLDIS Function

1 1 1 No flash protection

1 1 0 Protected low range

1 0 1 Protected high range

1 0 0 Protected high and low ranges

0 1 1 Full p-flash memory protected

0 1 0 Unprotected low range

0 0 1 Unprotected high range

0 0 0 Unprotected high and low ranges

1. For range sizes, see Table 4-14 and Table 4-15

The flash protection scheme can be used by applications requiring reprogramming in

single chip mode while providing as much protection as possible if reprogramming is not

required.

Flash and EEPROM

MC9S08PA60 Reference Manual, Rev. 1, 9/2012

84 Freescale Semiconductor, Inc.