Freescale Semiconductor Block Guide, EETX4K

Block Guide — S12EETX4KV0 V00.04

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, $47, 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

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

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

EECLK periods (see section 4.1.1) 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

bufferedbehind a sector erase abort command write sequence. The CBEIF flag will

notset after launching the sector erase abort command to indicatethat a command

shouldnot 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.

Freescale Semiconductor, I

Freescale Semiconductor, Inc.

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