PC912XDP512F0MPVR datasheet(1177/1348 Pages) FREESCALE

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Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1179

28.4.2.4

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 28-29. The sector erase

command write sequence is as follows:

1. Write to a Flash block address 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.

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