I am working on P16F84. I want to blink an led. I have a problem.

1. After having all the connection,the voltage at the output port of P16F84 is 0.5V and when the led is connected, the voltage drops to 0V. I am confusing that why the voltage drops even the voltage supplied at the VDD is 5V and MCLR pin is connected to 5V.
Regards