mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 544

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

256 KByte Flash Module (S12XFTMR256K1V1)
18.4.2.6
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
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.
544
Register
FSTAT
Program Once Command
CCOBIX[2:0]
MGSTAT1
MGSTAT0
ACCERR
Error Bit
Table 18-41. Program Once Command FCCOB Requirements
FPVIOL
000
001
010
011
100
101
Table 18-40. Program P-Flash Command Error Handling
S12XS Family Reference Manual, Rev. 1.10
Set if CCOBIX[2:0] != 101 at command launch
Set if command not available in current mode (see
Set if an invalid global address [22:0] is supplied
Set if a misaligned phrase address is supplied (global address [2:0] != 000)
Set if the global address [22:0] points to a protected area
Set if any errors have been encountered during the verify operation
Set if any non-correctable errors have been encountered during the verify
operation
Program Once phrase index (0x0000 - 0x0007)
0x07
Section
Program Once word 0 value
Program Once word 1 value
Program Once word 2 value
Program Once word 3 value
FCCOB Parameters
18.4.2.4. The Program Once command must only
Error Condition
Not Required
Table
18-28)
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