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S912XHZ512F1VAG Datasheet, PDF (196/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256 | |||
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Chapter 4 4 Kbyte EEPROM Module (S12XEETX4KV2)
4.4.2.3 Sector Erase Command
The sector erase operation will erase both words in a sector of EEPROM memory using an embedded
algorithm.
An example ï¬ow to execute the sector erase operation is shown in Figure 4-20. 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 ï¬ag 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 ï¬ag in the
ESTAT register will set and the sector erase command will not launch. Once the sector erase command has
successfully launched, the CCIF ï¬ag in the ESTAT register will set after the sector erase operation has
completed unless a new command write sequence has been buffered.
MC9S12XHZ512 Data Sheet, Rev. 1.06
196
Freescale Semiconductor
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