• The command write sequence used to set FTFE command parameters and launch
execution
• A description of all FTFE commands available
17.5.9.1 Command Write Sequence
FTFE commands are specified using a command write sequence illustrated in
. The FTFE module performs various checks on the command (FCCOB) content
and continues with command execution if all requirements are fulfilled.
Before launching a command, the ACCERR and FPVIOL bits in the FSTAT register
must be zero and the CCIF flag must read 1 to verify that any previous command has
completed. If CCIF is zero, the previous command execution is still active, a new
command write sequence cannot be started, and all writes to the FCCOB registers are
ignored.
Attempts to launch an FTFE command in VLP mode will be ignored. Attempts to launch
an FTFE command in HSRUN mode will be trapped with the ACCERR flag being set.
17.5.9.1.1 Load the FCCOB Registers
The user must load the FCCOB registers with all parameters required by the desired
FTFE command. The individual registers that make up the FCCOB data set can be
written in any order.
17.5.9.1.2 Launch the Command by Clearing CCIF
Once all relevant command parameters have been loaded, the user launches the command
by clearing the FSTAT[CCIF] bit by writing a '1' to it. The CCIF flag remains zero until
the FTFE command completes.
The FSTAT register contains a blocking mechanism, which prevents a new command
from launching (can't clear CCIF) if the previous command resulted in an access error
(FSTAT[ACCERR]=1) or a protection violation (FSTAT[FPVIOL]=1). In error
scenarios, two writes to FSTAT are required to initiate the next command: the first write
clears the error flags, the second write clears CCIF.
17.5.9.1.3 Command Execution and Error Reporting
The command processing has several steps:
Chapter 17 Flash Memory Module (FTFE)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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