Vss and Vdd
Power supply pins, Vdd is positive supply and Vss is the ground, where the maximum voltage supply is 6V and the minimum voltage is 2V but the average voltage is 5V so therefore I am using the 7805 voltage regulator IC for the supply.
Osc1 /clk in and osc2 / clk out
This pins are the oscillator connection for external timing
MCLR
Memory clear, this pin is use to erase memory location inside the PIC16F84A
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