MC9S12XD256MAL Datasheet, PDF (1219/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 29 128 Kbyte Flash Module (S12XFTX128K1V1)
START
Read: FCLKDIV register
Clock Register
Written
Check
FDIVLD
no
Set?
NOTE: FCLKDIV needs to
be set once after each reset.
yes
Write: FCLKDIV register
Read: FSTAT register
Address, Data,
Command
Buffer Empty Check
CBEIF
no
Set?
yes
Access Error and
Protection Violation
Check
ACCERR/
PVIOL
Set?
no
yes
Write: Flash Sector Address
1. _{and Dummy Data}
Write: FSTAT register
Clear ACCERR/PVIOL 0x30
2.
Write: FCMD register
Sector Erase Command 0x40
3.
Write: FSTAT register
Clear CBEIF 0x80
Read: FSTAT register
Bit Polling for
Command Completion
Check
CCIF
Set?
no
yes
EXIT
Figure 29-27. Example Sector Erase Command Flow
Freescale Semiconductor
MC9S12XDP512 Data Sheet, Rev. 2.21
1221