mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1178

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

Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
1178
Sequential
Programming
Decision
Clock Register
Written
Check
Address, Data,
Access Error and
Protection Violation
Check
Simultaneous
Multiple Flash Block
Decision
Bit Polling for
Buffer Empty
Check
Command
Buffer Empty Check
Bit Polling for
Command Completion
Check
Read: FCLKDIV register
1.
2.
3.
Figure 28-28. Example Program Command Flow
yes
Write: Flash Address
Write: FCMD register
Program Command 0x20
Write: FSTAT register
Clear CBEIF 0x80
START
FDIVLD
and program Data
Set?
Read: FSTAT register
Read: FSTAT register
Read: FSTAT register
MC9S12XDP512 Data Sheet, Rev. 2.17
yes
ACCERR/
yes
no
yes
CBEIF
CBEIF
no
no
Write: FCLKDIV register
Block?
Word?
CCIF
Set?
Set?
Set?
EXIT
PVIOL
Set?
Flash
Next
Next
no
yes
no
yes
yes
no
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