S912XHZ512F1VAG Datasheet, PDF (163/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 3 512 Kbyte Flash Module (S12XFTX512K4V3)
3.4.2.4 Sector Erase Command
The sector erase operation will erase all addresses in a 1 Kbyte sector of Flash memory using an embedded
algorithm.
An example flow to execute the sector erase operation is shown in Figure 3-29. The sector erase command
write sequence is as follows:
1. Write an aligned word to a valid address in the Flash array memory to start the command write
sequence for the sector erase command. The Flash address written determines the sector to be
erased while global address bits [9:0] and the data written are ignored. Multiple Flash sectors can
be simultaneously erased by writing to the same relative address in each Flash block.
2. Write the sector erase command, 0x40, to the FCMD register.
3. Clear the CBEIF flag in the FSTAT register by writing a 1 to CBEIF to launch the sector erase
command.
If a Flash sector to be erased is in a protected area of the Flash block, the PVIOL flag in the FSTAT register
will set and the sector erase command will not launch. Once the sector erase command has successfully
launched, the CCIF flag in the FSTAT 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
Freescale Semiconductor
163