17.5.11.9 Read 1s All Blocks command
The Read 1s All Blocks command checks if the program flash blocks, data flash blocks,
EEPROM backup records, and data flash IFR have been erased to the specified read
margin level, if applicable, and releases security if the readout passes, i.e. all data reads as
'1'.
Table 17-27. Read 1s All Blocks Command FCCOB Requirements
FCCOB Number
FCCOB Contents [7:0]
0
0x40 (RD1ALL)
1
Read-1 Margin Choice
After clearing CCIF to launch the Read 1s All Blocks command, the FTFE :
• sets the read margin for 1s according to
,
• checks the contents of the program flash, data flash, EEPROM backup records, and
data flash IFR are in the erased state.
If the FTFE confirms that these memory resources are erased, access control is disabled
and security is released by setting the FSEC[SEC] field to the unsecure state. The
security byte in the flash configuration field (see
Flash configuration field description
)
remains unaffected by the Read 1s All Blocks command. If the read fails, i.e. all flash
memory resources are not in the fully erased state, the FSTAT[MGSTAT0] bit is set.
The EEERDY and RAMRDY bits are clear during the Read 1s All Blocks operation and
are restored at the end of the Read 1s All Blocks operation.
The CCIF flag sets after the Read 1s All Blocks operation has completed.
Table 17-28. Margin Level Choices for Read 1s All Blocks
Read Margin Choice
Margin Level Description
0x00
Use the 'normal' read level for 1s
0x01
Apply the 'User' margin to the normal read-1 level
0x02
Apply the 'Factory' margin to the normal read-1 level
Table 17-29. Read 1s All Blocks Command Error Handling
Error Condition
Error Bit
Command not available in current mode/security
FSTAT[ACCERR]
An invalid margin choice is specified
FSTAT[ACCERR]
Read-1s fails
FSTAT[MGSTAT0]
Functional Description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
420
NXP Semiconductors
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