Datasheet sections 15.7.3 and 15.7.4 (MC68HC908LJ12/Rev2.1) want you to connect Vrefh to Vdda and Vrefl to Vssa.
mohammed wrote:
is that possible making the Vref low = 2.5 and making Vref High = 2.6 , meaning every 1mv equal 1 count, regardless the resistors errors, and noiseor the capability of the LJ12 isn't enough, i tried to find this info. in the DataSheet but i failed;