Information

When the FlexRAM is set to function as a RAM, normal read and write accesses to the

FlexRAM are available. When large sections of flash memory need to be programmed,

e.g. during factory programming, the FlexRAM can be used as the Section Program

Buffer for the Program Section command (see Program Section Command).

When making the FlexRAM available for EEPROM, the FTFL clears the

FCNFG[EEERDY] and FCNFG[RAMRDY] flags, overwrites the contents of the

FlexRAM allocated for EEPROM with a background pattern of all ones, and copies the

existing EEPROM data from the EEPROM backup record space to the FlexRAM. After

completion of the EEPROM copy-down, the FCNFG[EEERDY] flag is set. When the

FlexRAM is set to function as EEPROM, normal read and write access to the FlexRAM

is available, but writes to the FlexRAM also invoke EEPROM activity.

Table 28-75. Set FlexRAM Function Command Error Handling

Error Condition Error Bit

Command not available in current mode/security FSTAT[ACCERR]

FlexRAM Function Control Code is not defined FSTAT[ACCERR]

FlexRAM Function Control Code is set to make the FlexRAM available for EEPROM, but

FlexNVM is not partitioned for EEPROM

FSTAT[ACCERR]

28.4.13 Security

The FTFL module provides security information to the MCU based on contents of the

FSEC security register. The MCU then limits access to FTFL resources as defined in the

device's Chip Configuration details. During reset, the FTFL module initializes the FSEC

Configuration Field Description).

The following fields are available in the FSEC register. The settings are described in the

Flash Security Register (FTFL_FSEC) details.

Table 28-76. FSEC register fields

FSEC field Description

KEYEN Backdoor Key Access

MEEN Mass Erase Capability

FSLACC Freescale Factory Access

SEC MCU security

Chapter 28 Flash Memory Module (FTFL)

K10 Sub-Family Reference Manual, Rev. 6, Nov 2011

Freescale Semiconductor, Inc. 673