MC9S12XD256MAL Datasheet, PDF (1235/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 30 Security (S12X9SECV2)
Special single chip erase and unsecure sequence:
1. Reset into special single chip mode.
2. Write an appropriate value to the ECLKDIV register for correct timing.
3. Write 0xFF to the EPROT register to disable protection.
4. Write 0x30 to the ESTAT register to clear the PVIOL and ACCERR bits.
5. Write 0x0000 to the EDATA register (0x011A–0x011B).
6. Write 0x0000 to the EADDR register (0x0118–0x0119).
7. Write 0x41 (mass erase) to the ECMD register.
8. Write 0x80 to the ESTAT register to clear CBEIF.
9. Write an appropriate value to the FCLKDIV register for correct timing.
10. Write 0x00 to the FCNFG register to select Flash block 0.
11. Write 0x10 to the FTSTMOD register (0x0102) to set the WRALL bit, so the following writes
affect all Flash blocks.
12. Write 0xFF to the FPROT register to disable protection.
13. Write 0x30 to the FSTAT register to clear the PVIOL and ACCERR bits.
14. Write 0x0000 to the FDATA register (0x010A–0x010B).
15. Write 0x0000 to the FADDR register (0x0108–0x0109).
16. Write 0x41 (mass erase) to the FCMD register.
17. Write 0x80 to the FSTAT register to clear CBEIF.
18. Wait until all CCIF flags are set.
19. Reset back into special single chip mode.
20. Write an appropriate value to the FCLKDIV register for correct timing.
21. Write 0x00 to the FCNFG register to select Flash block 0.
22. Write 0xFF to the FPROT register to disable protection.
23. Write 0xFFBE to Flash address 0xFF0E.
24. Write 0x20 (program) to the FCMD register.
25. Write 0x80 to the FSTAT register to clear CBEIF.
26. Wait until the CCIF flag in FSTAT is are set.
27. Reset into any mode.
Freescale Semiconductor
MC9S12XDP512 Data Sheet, Rev. 2.21
1237