I WROTE A BLINK PROGRAM USING 16F628,

CMCON = 7 ; turn comparator off

; the osc used is INTRCIO in the OSCILATOR SELEC OF MELAB

LOOP ; this part copy form melab introduction

HIGH PORTB.7 ; make port B7 high
PAUSE 500 ; pause for 0.5 sec

LOW PORTB.7 ; make port B7 low
PAUSE 500

GOTO LOOP
END

it does not work. the input voltage is 5V ( to the pin 14), the output is 1.0 V for each output pin , no external osc connected; (i HAVE TRIED FOR 3 DIFFERENT IC'S, AND DIFFERENT INTERNAL OSC'S

ANY HELP I DO APPRE.