Information

Table 28-52. Program Once Command FCCOB Requirements (continued)

FCCOB Number FCCOB Contents [7:0]

7 Program Once Byte 3 value

After clearing CCIF to launch the Program Once command, the FTFL first verifies that

the selected record is erased. If erased, then the selected record is programmed using the

values provided. The Program Once command also verifies that the programmed values

read back correctly. The CCIF flag is set after the Program Once operation has

completed.

The reserved program flash 0 IFR location accessed by the Program Once command

cannot be erased and any attempt to program one of these records when the existing value

is not Fs (erased) is not allowed. Valid record index values for the Program Once

command range from 0x00 to 0x0F. During execution of the Program Once command,

any attempt to read addresses within program flash 0 returns invalid data.

Table 28-53. Program Once Command Error Handling

Error Condition Error Bit

Command not available in current mode/security FSTAT[ACCERR]

An invalid record index is supplied FSTAT[ACCERR]

The requested record has already been programmed to a non-FFFF value

FSTAT[ACCERR]

Any errors have been encountered during the verify operation FSTAT[MGSTAT0]

1. If a Program Once record is initially programmed to 0xFFFF_FFFF, the Program Once command is allowed to execute

again on that same record.

28.4.10.12 Erase All Blocks Command

The Erase All Blocks operation erases all flash memory, verifies all memory contents,

and releases MCU security.

Table 28-54. Erase All Blocks Command FCCOB Requirements

FCCOB Number FCCOB Contents [7:0]

0 0x44 (ERSALL)

After clearing CCIF to launch the Erase All Blocks command, the FTFL erases all

program flash memory, program flash 1 IFR space, then verifies that all are erased.

If the FTFL verifies that all flash memories were properly erased, security is released by

setting the FSEC[SEC] field to the unsecure state and the FCNFG[RAMRDY] bit is set.

The Erase All Blocks command aborts if any flash region is protected. The swap

indicator address in each program flash block is not implicitly protected from the Erase

Flash Operation in Low-Power Modes

K20 Sub-Family Reference Manual, Rev. 6, Nov 2011

640 Freescale Semiconductor, Inc.