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935309385574

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935309385574 技术参数

生命周期：	Active	Reach Compliance Code：	unknown
uPs/uCs/外围集成电路类型：	MICROCONTROLLER	Base Number Matches：	1

Addendum to MC68HC908QY4A, rev. 3

This addendum introduces a change to this data sheet.

Chapter 15 Development Support, Section 15.3.2 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 15 Development Support, Section 15.3.2 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).

MC68HC908QY4A Data Sheet, Addendum 5/2012

Freescale Semiconductor

12 3 4 5 6 7...202

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