MC9S08DN60F1CLF datasheet(49/356 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

NOTE

Before programming a particular byte in the Flash or EEPROM, the sector

in which that particular byte resides must be erased by a mass or sector erase

operation. Reprogramming bits in an already programmed byte without ﬁrst

performing an erase operation may disturb data stored in the Flash or

EEPROM memory.

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

check (0x05), byte program (0x20), burst program (0x25), sector erase (0x40), mass erase1 (0x41),

and sector erase abort (0x47). 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 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 and sector erase abort.

4. Wait until the FCCF bit in FSTAT is set. As soon as FCCF= 1, the operation has completed

successfully.

1. A mass erase is possible only when the Flash block is fully unprotected.

MC9S08DN60F1CLF Datasheet(PDF) 49 Page - Freescale Semiconductor, Inc