pic - PICkit2 flashing led with Button -

i using pickit2 low pin count demo board 16f690 chip. have been able write simple code turn leds on , off, upon trying utilize push button change state of leds, have been unable so. code below, along link schematic device.

#include <htc.h>  __config(mclre_off &  boren_off & pwrte_off & ieso_off & cp_off & fcmen_on);  void main() {     //initialization     trisabits.ra3 = 1;      //make button (ra3) input     triscbits.rc0 = 0;      //make led (rc0) output      for(;;)                 // loop forever     {         //set rc0 if ra3 low (button pressed), else clear rc0         if(portabits.ra3)         {             rc0 = 1;         }         else         {             rc0 = 0;         }     } } 

demo board user’s guide

ra3 /mclr, table 3 of datasheet says pullup on pin activated external /mclr configuration. if there no pullup, won't changes. pin read continously high or low?

i'd avoid using ra3, @ least while debugging, , if have use in release code, swap pin 1 when debugging.

another common problem porta is default analog input port. ansel bits set, , need cleared used digital input, ra3 not mapped analogue input.