MC9S12XD256MAL Datasheet, PDF (1091/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 26 4 Kbyte EEPROM Module (S12XEETX4KV2)
26.4.2.2 Program Command
The program operation will program a previously erased word in the EEPROM memory using an
embedded algorithm.
An example flow to execute the program operation is shown in Figure 26-19. The program command write
sequence is as follows:
1. Write to an EEPROM block address to start the command write sequence for the program
command. The data written will be programmed to the address written.
2. Write the program command, 0x20, to the ECMD register.
3. Clear the CBEIF flag in the ESTAT register by writing a 1 to CBEIF to launch the program
command.
If a word to be programmed is in a protected area of the EEPROM memory, the PVIOL flag in the ESTAT
register will set and the program command will not launch. Once the program command has successfully
launched, the CCIF flag in the ESTAT register will set after the program operation has completed unless a
new command write sequence has been buffered.
Freescale Semiconductor
MC9S12XDP512 Data Sheet, Rev. 2.21
1093