Sure, all my blogs are real case used in real projects, not just "idea". You should also look at Figure 29-4 then you will understand how it can work. In Figure 29-1, there is two "switch" symbols on the two multiplexers selected by CEIMSEL & CEIPSEL. I guess the two "switches" are CEIMEN and CEIPEN. When you select an analog channel by CEIPSEL, it doesn't mean the signal path is "connected" to comparator. CEIMEN and CEIPEN are used to connect them.
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