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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1066

Freescale Semiconductor

25.4.2.6

Sector Modify Command

The sector modify operation will erase both words in a sector of EEPROM memory followed by a

reprogram of the addressed word using an embedded algorithm.

An example ﬂow to execute the sector modify operation is shown in Figure 25-23. The sector modify

command write sequence is as follows:

1. Write to an EEPROM memory address to start the command write sequence for the sector modify

command. The EEPROM address written determines the sector to be erased and word to be

reprogrammed while byte address bit 0 is ignored.

2. Write the sector modify command, 0x60, 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 modiﬁed is in a protected area of the EEPROM memory, the PVIOL ﬂag in

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

command has successfully launched, the CCIF ﬂag in the ESTAT register will set after the sector modify

operation has completed unless a new command write sequence has been buffered.

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