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MON08 Vector Address FFFE-FFFF blank?

Question asked by elec_div elec_div on Jun 26, 2009
Latest reply on Jun 27, 2009 by elec_div elec_div

What do the next sentences mean?

 

"Monitor mode entry can be achieved without use of the higher test voltage, VTST, as long as vector addresses $FFFE and $FFFF are blank, thus reducing the hardware requirements for in-circuit programming."

 

"Monitor mode entry without high voltage, VTST, if reset vector is blank ($FFFE and $FFFF contain

$FF)"

 

I understand that there's no need to put a high voltage VTST if those vector addresses are blank, but how do I know if they are blank? When do these addresses change? How do I check their state while my code is running?

 

The text belongs to "MC68HC908AP Family Data Sheet, Rev. 4"

 

Thanks.

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