Datasheet

Chapter 2 128 Kbyte Flash Module (FTS128K1V1)
MC9S12E128 Data Sheet, Rev. 1.07
110 Freescale Semiconductor
Figure 2-23. Example Program Command Flow
Write: Flash Address
Write: FCMD register
Program Command 0x20
Write: FSTAT register
Clear CBEIF 0x80
1.
2.
3.
Clear ACCERR/PVIOL 0x30
Write: FSTAT register
yes
no
Access Error and
Protection Violation
no
and program Data
Bit Polling for
Buffer Empty
Check
Read: FSTAT register
yes
Read: FSTAT register
no
START
yes
Check
CBEIF
Set?
Address, Data,
Command
Buffer Empty Check
CBEIF
Set?
ACCERR/
PVIOL
Set?
EXIT
Write: FCLKDIV register
Read: FCLKDIV register
yes
no
Clock Register
Written
Check
FDIVLD
Set?
NOTE: FCLKDIV needs to
be set once after each reset.
no
yes
Sequential
Programming
Decision
Next
Word?
no
Bit Polling for
Command Completion
Check
Read: FSTAT register
yes
CCIF
Set?