Datasheet
Chapter 27 512 KByte Flash Module (S12XFTM512K3V1)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 1057
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.
27.4.2.8 Erase All Blocks Command
The Erase All Blocks operation will erase the entire P-Flash and D-Flash memory space including the EEE
nonvolatile information register.
Table 27-45. 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
Table 27-46. Program Once Command Error Handling
Register Error Bit Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 101 at command launch
Set if a Load Data Field command sequence is currently active
Set if command not available in current mode (see Table 27-30)
Set if an invalid phrase index is supplied
Set if the requested phrase has already been programmed
(1)
1. If a Program Once phrase is initially programmed to 0xFFFF_FFFF_FFFF_FFFF, the Program Once command will
be allowed to execute again on that same phrase.
FPVIOL None
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
FERSTAT EPVIOLIF None