FTS64K datasheet(34/44 Pages) FREESCALE

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FTS64K Block User Guide — Version V01.00

4.1.3 Valid Flash Commands

Table 4-1 summarizes the valid Flash User commands. Also shown are the effects of the commands on

the Flash

WARNING

It is not permitted to program a Flash word without first erasing the sector in which that word

resides.

4.1.4 Illegal Flash Operations

The ACCERR flag will be set during the command write sequence if any of the following illegal

operations are performed causing the command write sequence to immediately abort:

Writing to the Flash address space before initializing FCLKDIV.

Writing to the Flash address space in the range $8000-$BFFF when PPAGE register does not select

a 16K bytes page in the Flash block.

Writing a misaligned word or a byte to the valid Flash address space.

Writing to the Flash address space while CBEIF is not set.

Writing a second word to the Flash address space before executing a program or erase command on

the previously written word.

Writing to any Flash register other than FCMD after writing a word to the Flash address space.

7. Writing a second command to the FCMD register before executing the previously written

command.

Table 4-1 Valid Flash Commands

FCMD

Meaning

Flash

$05

Erase

Verify

Verify all memory bytes of the Flash block

are erased.

If the array is erased the BLANK bit will set in

the FSTAT register, upon command

completion.

$20

Program

Program a word (two bytes).

$40

Sector

Erase

Erase 256 words of Flash.

$41

Mass

Erase

Erase all the Flash array.

A mass erase of the full block is only possible

when FPLDIS, FPHDIS and FPOPEN are

set.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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