PC912XDP512F0MPVR datasheet(1062/1348 Pages) FREESCALE

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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1064

Freescale Semiconductor

25.4.2.5

Sector Erase Abort Command

The sector erase abort operation will terminate the active sector erase or sector modify operation so that

other sectors in an EEPROM block are available for read and program operations without waiting for the

sector erase or sector modify operation to complete.

An example ﬂow to execute the sector erase abort operation is shown in Figure 25-22. The sector erase

abort command write sequence is as follows:

1. Write to any EEPROM memory 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 ECMD register.

3. Clear the CBEIF ﬂag in the ESTAT 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

or sector modify 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 EEPROM sector may not be fully

erased and a new sector erase or sector modify 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 or

sector modify operation completes normally, the ACCERR ﬂag will not set upon completion of the

operation as indicated by the CCIF ﬂag being set. If the sector erase abort command is launched after the

sector modify operation has completed the sector erase step, the program step will be allowed to complete.

The maximum number of cycles required to abort a sector erase or sector modify operation is equal to four

EECLK periods (see Section 25.4.1.1, “Writing the ECLKDIV Register”) plus ﬁve bus cycles as measured

from the time the CBEIF ﬂag is cleared until the CCIF ﬂag is set.

NOTE

Since the ACCERR bit in the ESTAT 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 ESTAT 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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