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I want to use 4X1 (74153) multiplexer to my project. The output of the Mux is connected to a counter pin of PIC. I am confused about how to select common select Inputs. I am using RA1 and RA2 pins for this purpose.
Connect pins 1 and 15 to ground to enable the outputs. For MUX 1 provide inputs to pins 3, 4, 5, 6. To select the input that is to select the input that should appear at output set pin 14 and 2 to 00, 01, 10 or 11.
Channel selection pins 14 and 2 are common for both the muxes.