Datasheet

256 KByte Flash Module (S12XFTMR256K1V1)
S12XS Family Reference Manual, Rev. 1.13
544 Freescale Semiconductor
18.4.2.6 Program Once Command
The Program Once command restricts programming to a reserved 64 byte field (8 phrases) in the
nonvolatile information register located in P-Flash block 0. The Program Once reserved field can be read
using the Read Once command as described in Section 18.4.2.4. The Program Once command must only
be issued once since the nonvolatile information register in P-Flash block 0 cannot be erased. The Program
Once command must not be executed from the Flash block containing the Program Once reserved field to
avoid code runaway.
Upon clearing CCIF to launch the Program Once command, the Memory Controller first verifies that the
selected phrase is erased. If erased, then the selected phrase will be programmed and then verified with
read back. The CCIF flag will remain clear, setting only after the Program Once operation has completed.
The reserved nonvolatile information register accessed by the Program Once command cannot be erased
and any attempt to program one of these phrases a second time will not be allowed. Valid phrase index
values for the Program Once command range from 0x0000 to 0x0007. During execution of the Program
Once command, any attempt to read addresses within P-Flash block 0 will return invalid data.
Table 18-40. Program P-Flash Command Error Handling
Register Error Bit Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 101 at command launch
Set if command not available in current mode (see Table 18-28)
Set if an invalid global address [22:0] is supplied
Set if a misaligned phrase address is supplied (global address [2:0] != 000)
FPVIOL Set if the global address [22:0] points to a protected area
MGSTAT1 Set if any errors have been encountered during the verify operation
MGSTAT0
Set if any non-correctable errors have been encountered during the verify
operation
Table 18-41. Program Once Command FCCOB Requirements
CCOBIX[2:0] FCCOB Parameters
000 0x07 Not Required
001 Program Once phrase index (0x0000 - 0x0007)
010 Program Once word 0 value
011 Program Once word 1 value
100 Program Once word 2 value
101 Program Once word 3 value