NXP Semiconductors freescale K51 Series Reference Manual

Table 28-56. Read 1s All Blocks Command Error Handling (continued)Error Condition Error BitRead-1s fails FSTAT[MGSTAT0]28.4.12.10 Read Once CommandThe Read Once command provides read access to a reserved 64-byte field located in theprogram flash 0 IFR (see Program Flash IFR Map and Program Once Field). Access tothis field is via 16 records, each 4 bytes long. The Read Once field is programmed usingthe Program Once command described in Program Once Command.Table 28-57. Read Once Command FCCOB RequirementsFCCOB Number FCCOB Contents [7:0]0 0x41 (RDONCE)1 Read Once record index (0x00 - 0x0F)2 Not used3 Not usedReturned Values4 Read Once byte 0 value5 Read Once byte 1 value6 Read Once byte 2 value7 Read Once byte 3 valueAfter clearing CCIF to launch the Read Once command, a 4-byte Read Once record isread from the program flash IFR and stored in the FCCOB register. The CCIF flag is setafter the Read Once operation completes. Valid record index values for the Read Oncecommand range from 0x00 to 0x0F. During execution of the Read Once command, anyattempt to read addresses within the program flash block containing this 64-byte fieldreturns invalid data. The Read Once command can be executed any number of times.Table 28-58. Read Once Command Error HandlingError Condition Error BitCommand not available in current mode/security FSTAT[ACCERR]An invalid record index is supplied FSTAT[ACCERR]Chapter 28 Flash Memory Module (FTFL)K51 Sub-Family Reference Manual, Rev. 6, Nov 2011Freescale Semiconductor, Inc. 663