mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 108

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
108
Clock Register
Loaded
Check
Signature
Compared to
Known Value
Access
Error Check
Bit Polling for
Command
Completion Check
Figure 2-24. Example Data Compress Command Flow
Read: Register FCLKDIV
1.
2.
3.
Bit FDIVLD set?
Write: Flash address to start
compression and number of
word addresses to compress
Write: Register FCMD
Data Compress Command 0x06
Write: Register FSTAT
Clear bit CBEIF 0x80
Read: Register FDATA
Data Compress Signature
yes
Read: Register FSTAT
MC9S12E256 Data Sheet, Rev. 1.08
no
yes
yes
ACCERR
Signature
Set?
Write: Register FCLKDIV
Valid?
Bit
CCIF
Set?
EXIT
Bit
no
yes
no
no
NOTE: command write sequence
aborted by writing 0x00 to
FSTAT register.
NOTE: command write sequence
aborted by writing 0x00 to
FSTAT register.
Clear bit ACCERR 0x10
Write: Register FSTAT
Flash Region Compressed
Read: Register FSTAT
Erase and Reprogram
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