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Halcogen ADC bug or not

Other Parts Discussed in Thread: TMS570LS0432, HALCOGEN

Hello,

I just wanted to ask whether it is a bug.

I tried configuring TMS570LS0432 ADCgroup1 and left all configuration as is, just chose some PINs to enable from last row (PIN16, PIN17, PIN20 and PIN21). And when I select these pins "Cycle Time:" "t Total (us)" time doesn't change. Because of this whenever I chose some pin configuration (specifically PIN0, PIN10, PIN20 and PIN21) everytime I got readings from ADC channel, they came  not in correct order, besides one of reading wasn't done (randomly), so I had to enable one more additional pin.

When I chose any other ADC pins order, not including  (PIN16, PIN17, PIN20 and PIN21), things work like a charm.
I took a week to spot this.
So just wanted to inform others and clarify maybe these pins act like so intentionally?

Regards