45.4.10.1 Read 1s Block CommandThe Read 1s Block command checks to see if an entire program flash block has beenerased to the specified margin level. The FCCOB flash address bits determine whichflash block is erase-verified.Table 45-4. Read 1s Block Command FCCOB RequirementsFCCOB Number FCCOB Contents [7:0]0 0x00 (RD1BLK)1 Flash address [23:16] in the flash block to be verified2 Flash address [15:8] in the flash block to be verified3 Flash address [7:0]1 in the flash block to be verified4 Read-1 Margin Choice1. Must be longword aligned (Flash address [1:0] = 00).After clearing CCIF to launch the Read 1s Block command, the flash memory modulesets the read margin for 1s according to Table 45-5 and then reads all locations within theselected program flash block.Table 45-5. Margin Level Choices for Read 1s BlockRead Margin Choice Margin Level Description0x00 Use the 'normal' read level for 1s0x01 Apply the 'User' margin to the normal read-1 level0x02 Apply the 'Factory' margin to the normal read-1 levelTable 45-6. Read 1s Block Command Error HandlingError Condition Error BitCommand not available in current mode/security FSTAT[ACCERR]An invalid margin choice is specified FSTAT[ACCERR]Program flash is selected and the address is out of program flash range FSTAT[ACCERR]Flash address is not longword aligned FSTAT[ACCERR]Read-1s fails FSTAT[MGSTAT0]45.4.10.2 Read 1s Section CommandThe Read 1s Section command checks if a section of program flash memory is erased tothe specified read margin level. The Read 1s Section command defines the startingaddress and the number of longwords to be verified.Functional DescriptionKL27 Sub-Family Reference Manual , Rev. 5, 01/2016912 Freescale Semiconductor, Inc.
