00004A  99B5    L10:    SBIC PINB,5 ;Skip if PINB5 is cleared
00004B  CFEB        RJMP L9
00004C  2F17        MOV R17,R23     ;Move r23 to r17 /empty
00004D  2710        EOR R17,R16     ;r17 = r17 xor r16
00004E  FF10        SBRS R17,0      ;skip if 0bit is set in r17
00004F  CFFA        RJMP L10