PC912XDP512F0MPVR datasheet(1058/1348 Pages) FREESCALE

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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

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

ESTAT register will set and the sector erase command will not launch. Once the sector erase command has

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.

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