My question concerns Table 8-18 of SPRUH18D, and in particular the ACQPS field of the ADCSOCxCTL register. I understand why there would be a minimum acceptable acquisition window, as there must be sufficient time to establish a capacitor voltage. Hence I can see why 00h, 01h, 02h, 03h, 04h, 05h are listed as invalid selections (although it would seem more natural to specify the minimum acceptable acquisition window in terms of seconds instead of clock cycles, since different applications will use different clock frequencies). What really confuses me is that the document also includes the following excerpt:
"Other invalid selections: 10h, 11h, 12h, 13h, 14h, 1Dh, 1Eh, 1Fh, 20h, 21h, 2Ah, 2Bh, 2Ch, 2Dh, 2Eh, 37h, 38h, 39h, 3Ah, 3Bh"
Why would these be invalid selections? What is the reasoning for a periodic pattern of invalid selections?
