Chapter 25 256 KByte Flash Module (S12XFTM256K2V1)
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
939
NOTE
User margin levels can be used to check that Flash memory contents have
adequate margin for normal level read operations. If unexpected results are
encountered when checking Flash memory contents at user margin levels, a
potential loss of information has been detected.
25.4.2.14 Set Field Margin Level Command
The Set Field Margin Level command, valid in special modes only, causes the Memory Controller to set
the margin level specified for future read operations of a specific P-Flash or D-Flash block.
Upon clearing CCIF to launch the Set Field Margin Level command, the Memory Controller will set the
field margin level for the targeted block and then set the CCIF flag.
Valid margin level settings for the Set Field Margin Level command are defined in
Table 25-59. Set User Margin Level Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 001 at command launch
Set if a Load Data Field command sequence is currently active
Set if command not available in current mode (see
)
Set if an invalid global address [22:16] is supplied
Set if an invalid margin level setting is supplied
FPVIOL
None
MGSTAT1
None
MGSTAT0
None
FERSTAT
EPVIOLIF
None
Table 25-60. Set Field Margin Level Command FCCOB Requirements
CCOBIX[2:0]
FCCOB Parameters
000
0x0E
Global address [22:16] to identify the Flash
block
001
Margin level setting
Table 25-61. Valid Set Field Margin Level Settings
CCOB
(CCOBIX=001)
Level Description
0x0000
Return to Normal Level
0x0001
User Margin-1 Level
(1)
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