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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)
MC9S12XDP512 Data Sheet, Rev. 2.17
1060
Freescale Semiconductor
25.4.2.3
Sector Erase Command
The sector erase operation will erase both words in a sector of EEPROM memory using an embedded
algorithm.
An example flow to execute the sector erase operation is shown in
Figure 25-20
. The sector erase
command write sequence is as follows:
1. Write to an EEPROM memory address to start the command write sequence for the sector erase
command. The EEPROM address written determines the sector to be erased while global address
bits [1:0] and the data written are ignored.
2. Write the sector erase command, 0x40, to the ECMD register.
3. Clear the CBEIF flag in the ESTAT register by writing a 1 to CBEIF to launch the sector erase
command.
If an EEPROM sector to be erased is in a protected area of the EEPROM memory, the PVIOL flag in the
ESTATregisterwillsetandthesectorerasecommandwillnotlaunch.Oncethesectorerasecommandhas
successfully launched, the CCIF flag in the ESTAT register will set after the sector erase operation has
completed unless a new command write sequence has been buffered.