S12X Conversion Sequence Length and WRAP

[maatweeb]

What is the difference between using the conversion sequence length and the WRAP bits?  If SCAN = 1 and MULT = 1 (continuous scan and multiple channels), won't the conversion sequence length and the WRAP bits be doing the same function?  Does one have a precendence over the other?  Can I only write to WRAP and leave conversion sequence at the default?  Currently I just set them to be equal, i.e. wrap at AN7 and conversion length = 8.

[kef · Accepted solution]

You can start conversion sequence from channel other than AN0. With default WRAP setting or on older S12 which don't have WRAP bits, you could start for example sequence of 8 channels from AN12. That would convert channels AN12 to AN15, then AN0 to AN3. I didn't try any wrapping myself yet, but I think with wrap set to 13, you could convert AN12,AN13, then AN0 to AN5. This makes sense in case tight layout asks you to skip some ATD pins.

[maatweeb]

Sounds good.  Thanks.