Digital High with 3.3V and 1K resistor
Assuming the switch is not a shorting type (most are break before make), the R1 1K resistor is not necessary (and could be harmful to noise margin if the value of R7 was too low relative to 1K), however you may wish to have a resistor between pin 9 and SEL of a few K to help protect the IC against ESD that could come through the switch.
Edit: Eg



simulate this circuit &ndash; Schematic created using CircuitLab
In fact if you have the pulldown R7 you may not need the ground connection on the switch at all.