Addendum to MC68HC908QB8, rev. 3
This addendum introduces a change to this data sheet.
Chapter 17 Development Support, Section 17.3.2 Security
A security feature discourages unauthorized reading of FLASH locations while in monitor mode. The host
can bypass the security feature at monitor mode entry by sending eight security bytes that match the
bytes at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain user-defined data.
NOTE
Do not leave locations $FFF6–$FFFD blank. For security reasons, program
locations $FFF6–$FFFD even if they are not used for vectors.
Changes to:
Chapter 17 Development Support, Section 17.3.2 Security
A security feature discourages unauthorized reading of FLASH locations while in monitor mode. The host
can bypass the security feature at monitor mode entry by sending eight security bytes that match the
bytes at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain user-defined data.
NOTE
Do not leave locations $FFF6–$FFFD blank. For security reasons, program
locations $FFF6–$FFFD even if they are not used for vectors. An improved
security function denies monitor mode entry if five or more of the eight
security bytes are $00 (zero bytes).
MC68HC908QB8 Data Sheet, Addendum 5/2012
Freescale Semiconductor
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MC68HC908QB8
MC68HC908QB4
MC68HC908QY8
Data Sheet
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This product incorporates SuperFlash® technology licensed from SST.
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MC68HC908QB8 Data Sheet, Rev. 3
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