Datasheet

Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
MC9S12XDP512 Data Sheet, Rev. 2.21
1180 Freescale Semiconductor
Figure 28-29. Example Sector Erase Command Flow
Write: Flash Sector Address
Write: FCMD register
Sector Erase Command 0x40
Write: FSTAT register
Clear CBEIF 0x80
1.
2.
3.
Clear ACCERR/PVIOL 0x30
Write: FSTAT register
yes
no
Access Error and
Protection Violation
and Dummy Data
Read: FSTAT register
Read: FSTAT register
no
START
yes
Check
CBEIF
Set?
Next
no
yes
Address, Data,
Command
Buffer Empty Check
Flash
Block?
ACCERR/
PVIOL
Set?
EXIT
by 128K (skip unimplemented Flash)
Decrement Global Address
Write: FCLKDIV register
Read: FCLKDIV register
yes
no
Clock Register
Written
Check
FDIVLD
Set?
NOTE: FCLKDIV needs to
be set once after each reset.
Simultaneous
Multiple Flash Block
Decision
no
Bit Polling for
Command Completion
Check
yes
CCIF
Set?