mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1180

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
1180
Clock Register
Written
Check
Address, Data,
Access Error and
Protection Violation
Check
Simultaneous
Multiple Flash Block
Decision
Bit Polling for
Command Completion
Check
Command
Buffer Empty Check
Read: FCLKDIV register
Figure 28-29. Example Sector Erase Command Flow
1.
2.
3.
yes
START
Write: Flash Sector Address
Write: FCMD register
Sector Erase Command 0x40
Write: FSTAT register
Clear CBEIF 0x80
FDIVLD
and Dummy Data
Set?
Read: FSTAT register
Read: FSTAT register
MC9S12XDP512 Data Sheet, Rev. 2.17
yes
ACCERR/
yes
no
CBEIF
no
Write: FCLKDIV register
Block?
CCIF
Set?
Set?
EXIT
PVIOL
Set?
Flash
Next
no
yes
no
yes
no
Write: FSTAT register
Clear ACCERR/PVIOL 0x30
Decrement Global Address
by 128K (skip unimplemented Flash)
NOTE: FCLKDIV needs to
be set once after each reset.
Freescale Semiconductor