banksel  ANSELB
clr  ANSELB             ; make all pins digital
banksel LATB
clr  LATB              ; set latch to known value
banksel TRISB     
clr   TRISB            ; set all PORTB pins outputs
banksel LATB 
movlw    0x0F 
movwf LATB                ; set lower 4 pins of PORTB
goto $                   ; loop forever