I make this beginner program for 4 LED command. What is wrong? What is message 302? Why in MPLAB 4 don't change the PORTA or PORTB? All changes is in TRISA or TRISB? Need some setting for port? Thanks all! Willi list p=16c84 #include "p16c84.inc" org 00 INI: CLRF PORTA BSF STATUS,RP0 MOVLW 0X1F MOVWF TRISA CLRF PORTB BSF STATUS,RP0 MOVLW 0XF0 MOVWF TRISB BSF PORTB,4 MAIN: ;BTFSS PORTA,0 CALL ROT GOTO MAIN ROT: RLF PORTB,1 BTFSC STATUS,C BSF PORTB,4 RETURN END