HCS08 datasheet(53/374 Pages) NXP

53 / 374 page

Chapter 4 Memory

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

2. Write the command code for the desired command to FCMD. The five valid commands are blank

check (0x05), byte program (0x20), burst program (0x25), page erase (0x40), and mass erase

(0x41). The command code is latched into the command buffer.

3. Write a 1 to the FCBEF bit in FSTAT to clear FCBEF and launch the command (including its

address and data information).

A partial command sequence can be aborted manually by writing a 0 to FCBEF any time after the write to

the memory array and before writing the 1 that clears FCBEF and launches the complete command.

Aborting a command in this way sets the FACCERR access error flag which must be cleared before

starting a new command.

A strictly monitored procedure must be obeyed or the command will not be accepted. This minimizes the

possibility of any unintended changes to the flash memory contents. The command complete flag (FCCF)

indicates when a command is complete. The command sequence must be completed by clearing FCBEF

to launch the command. Figure 4-2 is a flowchart for executing all of the commands except for burst

programming. The FCDIV register must be initialized before using any flash commands. This only must

be done once following a reset.

Figure 4-2. Flash Program and Erase Flowchart

START

WRITE TO FLASH

TO BUFFER ADDRESS AND DATA

WRITE COMMAND TO FCMD

YES

FPVIOL OR

WRITE 1 TO FCBEF

TO LAUNCH COMMAND

AND CLEAR FCBEF (Note 2)

FCCF ?

ERROR EXIT

DONE

Note 2:

Wait at least four bus cycles

FACCERR ?

CLEAR ERROR

FACCERR ?

WRITE TO FCDIV (Note 1)

Note 1:

Required only once after reset.

before checking FCBEF or FCCF.

FLASH PROGRAM AND

ERASE FLOW

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