Freescale Semiconductor Starter Kit for MC9S12G TRK-USB-S12G128 TRK-USB-S12G128 数据表

Freescale Semiconductor

869

Upon clearing CCIF to launch the Set User Margin Level command, the Memory Controller will set the
user margin level for the targeted block and then set the CCIF flag.

When the EEPROM block is targeted, the EEPROM user margin levels are
applied only to the EEPROM reads. However, when the P-Flash block is
targeted, the P-Flash user margin levels are applied to both P-Flash and
EEPROM reads. It is not possible to apply user margin levels to the P-Flash
block only.

Valid margin level settings for the Set User Margin Level command are defined in

.

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.

0x0000

Return to Normal Level

0x0001

User Margin-1 Level

1

1

Read margin to the erased state

0x0002

User Margin-0 Level

2

2

Read margin to the programmed state

FSTAT

ACCERR

Set if CCOBIX[2:0] != 001 at command launch

Set if command not available in current mode (see

)

Set if an invalid FlashBlockSelectionCode[1:0] is supplied (See

 )

Set if an invalid margin level setting is supplied

FPVIOL

None

MGSTAT1

None

MGSTAT0

None