MC9S12HZ256 Datasheet, PDF (106/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 3 2 Kbyte EEPROM Module (EETS2KV1)
For sector erase, the MCU address bits AB[1:0] are ignored.
For mass erase, any address within the block is valid to start the command.
MC9S12HZ256 Data Sheet, Rev. 2.04
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Freescale Semiconductor