Техническая Спецификация для Freescale Semiconductor Tower System Eval Kit for MC9S12GN32 TWR-S12GN32-KIT TWR-S12GN32-KIT

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Freescale Semiconductor

This section provides details of all available Flash commands launched by a command write sequence. The
ACCERR bit in the FSTAT register will be set during the command write sequence if any of the following
illegal steps are performed, causing the command not to be processed by the Memory Controller:

•

Starting any command write sequence that programs or erases Flash memory before initializing the
FCLKDIV register

•

Writing an invalid command as part of the command write sequence

•

For additional possible errors, refer to the error handling table provided for each command

If a Flash block is read during execution of an algorithm (CCIF = 0) on that same block, the read operation
will return invalid data if both flags SFDIF and DFDIF are set. If the SFDIF or DFDIF flags were not
previously set when the invalid read operation occurred, both the SFDIF and DFDIF flags will be set.

If the ACCERR or FPVIOL bits are set in the FSTAT register, the user must clear these bits before starting
any command write sequence (see

).

A Flash word or phrase must be in the erased state before being
programmed. Cumulative programming of bits within a Flash word or
phrase is not allowed.

The Erase Verify All Blocks command will verify that all P-Flash and EEPROM blocks have been erased.

Upon clearing CCIF to launch the Erase Verify All Blocks command, the Memory Controller will verify
that the entire Flash memory space is erased. The CCIF flag will set after the Erase Verify All Blocks
operation has completed. If all blocks are not erased, it means blank check failed, both MGSTAT bits will
be set.

000

0x01

Not required

FSTAT

ACCERR

Set if CCOBIX[2:0] != 000 at command launch

FPVIOL

None

MGSTAT1

Set if any errors have been encountered during the reador if blank check failed .

MGSTAT0

Set if any non-correctable errors have been encountered during the read or if
blank check failed.