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Does ATD on 9s12 round or truncate?

Question asked by James Smith on Feb 23, 2014
Latest reply on Feb 25, 2014 by lama



I'm trying to determine whether the binary search algorithm mentioned in the 9s12 documentation rounds or truncates signals into the analogue to digital converter (ATD).  I was reading through the MC9S12C Family Data Sheet (MC9S12C Family Rev. 1.15 7/2005) and it says "By following a binary search algorithm, the A/D machine locates the approximating potential that is nearest to the sampled potential."  There's not a whole lot of detail as to how it actually does this.  If the voltage signal corresponded to a 10bit-configured ATD output of 988.8, would it truncate it down to 988 or round up to 989?  Any pointer to an official document that explains this would be much appreciated.