;clears (sum)
mov r4, #0x00
mov r5, #0x00
;i (sum)
mov r0, #0x00
mov r1, #0x00
;save away len
mov _sum_len_1_1, dpl
mov (_sum_len_1_1 +1), dph
;load datapointer with adress of array
mov dpl, _sum_PARM_2
mov dph, (_sum_PARM_2+1)

0001$:
	; check the for condition
	clr C ; clear carry
	mov A, r0
	subb A, _sum_len_1_1
	mov A ,r1
	xrl A ,#0x80
	mov B, (_sum_len_1_1+1)
	xrl B, #0x80
	subb A,B
	;jump to exit
	jnc 0002$
	;fetch the array element and add
	movx A, @DPTR
	inc DPTR
	add A, r4
	mov r4, A
	movx A, @DPTR
	addc A, r5
	mov r5, A
	inc DPTR
	;increment loop counter and jump
	inc r0
	cjne r0, #0x00, 0001$
	inc r1
	sjmp 0001$

0002$:
; prepare return values
mov dpl, r4
mov dph, r5
ret