Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manual De Usuario

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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 the SFDIF or DFDIF flags were not previously set when the invalid read
operation occurred, both the SFDIF and DFDIF flags will be set and the FECCR registers will be loaded
with the global address used in the invalid read operation with the data and parity fields set to all 0.

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 D-Flash blocks have been erased.

0x0B

Unsecure Flash

Supports a method of releasing MCU security by erasing all D-Flash (and P-Flash) blocks
and verifying that all D-Flash (and P-Flash) blocks are erased.

0x0D

Set User Margin

Level

Specifies a user margin read level for the D-Flash block.

0x0E

Set Field Margin

Level

Specifies a field margin read level for the D-Flash block (special modes only).

0x10

Erase Verify

D-Flash Section

Verify that a given number of words starting at the address provided are erased.

0x11

Program D-Flash

Program up to four words in the D-Flash block.

0x12

Erase D-Flash

Sector

Erase all bytes in a sector of the D-Flash block.

000

0x01

Not required