time_display:
	push stu
	push stu
	rcall binbcd
	pop tmp1
	pop tmp2	
ret

binbcd:
	push ZH
	push ZL
	in ZH, SPH
	in ZL, SPL
	adiw ZH:ZL, 5
	push r16
	push r17
	ld r16, Z
	
	ldi r17, -1			;errechnet 10-Stelle in r17
	_10E1:
		inc r17
		subi r16, 10
		brcc _10E1
	
	subi r16, -10			;errechnet 1-Stelle in r16
	ST Z, r16
	ST -Z, r17
	pop r17
	pop r16
	pop ZL
	pop ZH
ret