Source Code: 

    

      

      ÿþ	;.INCLUDE "M32DEF.INC"

		SBI	DDRB,0		

		SBI	DDRB,1		

		SBI	DDRB,2		

		SBI	DDRB,3		

		CBI	DDRA,7		

MONITOR:	SBIS	PINA,7		

		RJMP	CLKWISE	

		CBI	DDRB,1		

		CBI	DDRB,2		

		SBI	DDRB,0		

		SBI	DDRB,3		

		JMP	MONITOR

CLKWISE:	CBI	DDRB,0		

		CBI	DDRB,3		

		SBI	DDRB,1		

		SBI	DDRB,2		

		JMP	MONITOR