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I need instruction about division algorithm in 8051

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tri2061990

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Code
;INPUT R7.R6 : dividend 16 BIT , R7->high byte, R6->low byte
; B:divisor
;
;OUTPUT : R7.R6 : quotient
; B : remainder

Code: 
DIV16TO8     :
	PUSH 02H ;
	PUSH ACC ;
	MOV R2,#16 ; 
	CLR A
DIVIDE     :
	XCH A,R6
	CLR C ; 
	RLC A  ; 
	XCH A,R6 ; 
	XCH A,R7 ; 
	RLC A ; 
	XCH A,R7
	RLC A ; 
	CJNE A,B,NOT_EQUAL ; 
	SJMP A_GREATER_EQ_B 
NOT_EQUAL    :
	JC BELOW ; N: 
A_GREATER_EQ_B:
	SUBB A,B ;Y: 
	XCH A,R6
	ORL A,#1 ;
	XCH A,R6	; 
BELOW     :
	DJNZ R2,DIVIDE ; 
	XCH A,B ; 
	POP ACC
	POP 02H
	RET

I can understand how it work,can you explain it to me?
 
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