Freescale Semiconductor Block Guide, EETX4K

Block Guide — S12EETX4KV0 V00.04

NOTE:

The user should not program an EEPROM word without first erasing the sector in

which that word resides.

4.1.3.1 Erase Verify Command

The erase verify operation will verify that the EEPROM memory is erased.

Anexample flow to execute the erase verify operation is shown in Figure 4-2. The erase verify command

write sequence is as follows:

1. Write to an EEPROM address to start the command write sequence for the erase verify command.

The address and data written will be ignored.

2. Write the erase verify command, $05, to the ECMD register.

3. Clear the CBEIF flag in the ESTAT register by writing a “1” to CBEIF to launch the erase verify

command.

Afterlaunching the erase verify command, the CCIF flag in the ESTAT register will set after the operation

has completed unless a new command write sequence has been buffered. The number of bus cycles

required to execute the erase verify operation is equal to the number of words in the EEPROM memory

plus 14 bus cycles as measured from the time the CBEIF flag is cleared until the CCIF flag is set. Upon

completionof the erase verify operation, the BLANK flag in the ESTAT register will be set if all addresses

in the EEPROM memory are verified to be erased. If any address in the EEPROM memory is not erased,

the erase verify operation will terminate and the BLANK flag in the ESTAT register will remain clear.

$20 Program Program a word (two bytes) in the EEPROM block.

$40 Sector

Erase Erase all four memory bytes in a sector of the EEPROM block.

$41 Mass

Erase

Erase all memory bytes in the EEPROM block.

Amass erase of the full EEPROM block is only possible when EPOPEN and EPDIS bits

in the EPROT register are set prior to launching the command.

$47 SectorErase

Abort

Abort the sector erase operation.

The sector erase operation will terminate according to a set procedure. The EEPROM

sector should not be considered erased if the ACCERR ﬂag is set upon command

completion.

$60 Sector

Modify Erase all four memory bytes in a sector of the EEPROM block and reprogram the

addressed word.

Table 4-1 EEPROM Command Description

ECMDB Command Function on EEPROM Memory

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