Content originally posted in LPCWare by nxp_apps on Fri Feb 21 14:42:12 MST 2014
Hi,
By datasheet, the High-level input voltage (logic '1') is minimum 0.7Vdd, and the LOW-level input voltage (logic '0') is max 0.3Vdd.
As long as your Vdd supply is within the supply spec range from 1.8 v to 3.6 v, the specs mentioned will apply.
The input voltage levels are not software programmable.
Thanks.
nxp_apps