Upon clearing CCIF to launch the Program Check command, the flash memory modulesets the read margin for 1s according to Table 27-30, reads the specified longword, andcompares the actual read data to the expected data provided by the FCCOB. If thecomparison at margin-1 fails, the FSTAT[MGSTAT0] bit is set.The flash memory module then sets the read margin for 0s, re-reads, and compares again.If the comparison at margin-0 fails, the FSTAT[MGSTAT0] bit is set. The CCIF flag isset after the Program Check operation completes.The supplied address must be longword aligned (the lowest two bits of the byte addressmust be 00):• Byte 3 data is written to the supplied byte address ('start'),• Byte 2 data is programmed to byte address start+0b01,• Byte 1 data is programmed to byte address start+0b10,• Byte 0 data is programmed to byte address start+0b11.NOTESee the description of margin reads, Margin Read CommandsTable 27-30. Margin Level Choices for Program CheckRead Margin Choice Margin Level Description0x01 Read at 'User' margin-1 and 'User' margin-00x02 Read at 'Factory' margin-1 and 'Factory' margin-0Table 27-31. Program Check Command Error HandlingError Condition Error BitCommand not available in current mode/security FSTAT[ACCERR]An invalid flash address is supplied FSTAT[ACCERR]Flash address is not longword aligned FSTAT[ACCERR]An invalid margin choice is supplied FSTAT[ACCERR]Either of the margin reads does not match the expected data FSTAT[MGSTAT0]27.4.10.3 Read Resource CommandThe Read Resource command allows the user to read data from special-purpose memoryresources located within the flash memory module. The special-purpose memoryresources available include program flash IFR space and the Version ID field. Eachresource is assigned a select code as shown in Table 27-33.Chapter 27 Flash Memory Module (FTFA)KL25 Sub-Family Reference Manual, Rev. 3, September 2012Freescale Semiconductor, Inc. 443
