PC912XDP512F0MPVR datasheet(1140/1348 Pages) FREESCALE

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Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1142

Freescale Semiconductor

27.4.2.6

Sector Erase Abort Command

The sector erase abort operation will terminate the active sector erase operation so that other sectors in a

Flash block are available for read and program operations without waiting for the sector erase operation to

complete.

An example ﬂow to execute the sector erase abort operation is shown in Figure 27-31. The sector erase

abort command write sequence is as follows:

1. Write to any Flash block address to start the command write sequence for the sector erase abort

command. The address and data written are ignored.

2. Write the sector erase abort command, 0x47, to the FCMD register.

3. Clear the CBEIF ﬂag in the FSTAT register by writing a 1 to CBEIF to launch the sector erase abort

command.

If the sector erase abort command is launched resulting in the early termination of an active sector erase

operation, the ACCERR ﬂag will set once the operation completes as indicated by the CCIF ﬂag being set.

The ACCERR ﬂag sets to inform the user that the Flash sector may not be fully erased and a new sector

erase command must be launched before programming any location in that speciﬁc sector. If the sector

erase abort command is launched but the active sector erase operation completes normally, the ACCERR

ﬂag will not set upon completion of the operation as indicated by the CCIF ﬂag being set. Therefore, if the

ACCERR ﬂag is not set after the sector erase abort command has completed, a Flash sector being erased

when the abort command was launched will be fully erased. The maximum number of cycles required to

abort a sector erase operation is equal to four FCLK periods (see Section 27.4.1.1, “Writing the FCLKDIV

set. If sectors in multiple Flash blocks are being simultaneously erased, the sector erase abort operation

will be applied to all active Flash blocks without writing to each Flash block in the sector erase abort

command write sequence.

NOTE

Since the ACCERR bit in the FSTAT register may be set at the completion

of the sector erase abort operation, a command write sequence is not

allowed to be buffered behind a sector erase abort command write sequence.

The CBEIF ﬂag will not set after launching the sector erase abort command

to indicate that a command should not be buffered behind it. If an attempt is

made to start a new command write sequence with a sector erase abort

operation active, the ACCERR ﬂag in the FSTAT register will be set. A new

command write sequence may be started after clearing the ACCERR ﬂag, if

set.

NOTE

The sector erase abort command should be used sparingly since a sector

erase operation that is aborted counts as a complete program/erase cycle.

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