query 1:
when switch on the device and no voltage apply on 7754 then default voltage is 3 or 4 volts, not zero on no input apply.
query 2:
when load and supply will applied then on changing load by toggle switches, display will wash off i.e, MCU+7754+lcd all will hang up. in programming in opmode register i have enabled both of the HPFs and LPFs.....
i am stucking with this kind of problem......i am using 16x2 HD77480 base lcd, this will also hangup in many of my projects, where the switching or toggling will occur...
help me out in this