NXP Semiconductors Kinetis KE1xZ256, Reference Manual

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FTFE_FCNFG field descriptions (continued)
Field Description
This bit issues a request to the memory controller to execute the Erase All Blocks command and release
security. ERSAREQ is not directly writable but is under indirect user control. Refer to the device's Chip
Configuration details on how to request this command.
The ERSAREQ bit sets when an erase all request is triggered external to the FTFE and CCIF is set (no
command is currently being executed). ERSAREQ is cleared by the FTFE when the operation completes.
0 No request or request complete
1 Request to:
1. run the Erase All Blocks command,
2. verify the erased state,
3. program the security byte in the Flash Configuration Field to the unsecure state, and
4. release MCU security by setting the FSEC[SEC] field to the unsecure state
4
ERSSUSP
Erase Suspend
The ERSSUSP bit allows the user to suspend (interrupt) the Erase Flash Sector command while it is
executing.
0 No suspend requested
1 Suspend the current Erase Flash Sector command execution
3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
2
PFLSH
FTFE configuration
0 FTFE configuration supports one program flash block and one FlexNVM block
1
Reserved
1
RAMRDY
RAM Ready
This flag indicates the current status of the FlexRAM.
The state of the RAMRDY flag is normally controlled by the Set FlexRAM Function command. During the
reset sequence, the RAMRDY flag is cleared if the FlexNVM block is partitioned for EEPROM and will be
set if the FlexNVM block is not partitioned for EEPROM . The RAMRDY flag is cleared if the Program
Partition command is run to partition the FlexNVM block for EEPROM. The RAMRDY flag sets after
completion of the Erase All Blocks command or execution of the erase-all operation triggered external to
the FTFE.
0 FlexRAM is not available for traditional RAM access
1
FlexRAM is available as traditional RAM only; writes to the FlexRAM do not trigger EEPROM
operations
0
EEERDY
This flag indicates if the EEPROM backup data has been copied to the FlexRAM and is therefore available
for read access.
During the reset sequence, the EEERDY flag remains clear while CCIF=0 and only sets if the FlexNVM
block is partitioned for EEPROM.
0 FlexRAM is not available for EEPROM operation
1 FlexRAM is available for EEPROM operations where:
• reads from the FlexRAM return data previously written to the FlexRAM in EEPROM mode and
• writes launch an EEPROM operation to store the written data in the FlexRAM and EEPROM
backup
Memory map and registers
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
298 NXP Semiconductors