NXP Semiconductors MWCT101 S Series, Reference Manual

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32.5.11.8 Read 1s All Blocks command
The Read 1s All Blocks command checks if the program flash blocks, data flash blocks,
emulated 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 32-36. 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 FTFC:
• sets the read margin for 1s according to Table 32-37 ,
• checks the contents of the program flash, data flash, emulated EEPROM backup
records, and data flash IFR are in the erased state.
If the FTFC confirms that these memory resources are erased, 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 32-37. 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 32-38. Read 1s All Blocks command error handling
Error Condition Error Bit
An invalid margin choice is specified FSTAT[ACCERR]
Read-1s fails FSTAT[MGSTAT0]
Functional description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
764 NXP Semiconductors