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Explanation needed in arm assembly language programming.

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rangerskm

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i found some of the assembly programs in arm difficult to understand,KEIL IDE 4.74 used.please explain the below programs,thanking u in advance..

Code: 
   	AREA INI,CODE,READWRITE
	MOV R6,#0
	LDR R3,=0X40000000
	LDR R5,=0X40000050
	LDR R4,=DAT

L4	LDR R2,[R4],#4
	MOV R0,R2
	MOV R1,#0X02

L1	SUB R0,R0,R1
	CMP R0,R1
	BGE L1
	
	CMP R0,#0
	BEQ L2
	ADD R1,R1,#1
	MOV R0,R2
	CMP R1,R2
	BNE L1

	STR R2,[R3],#4

	B L3

L2	STR R2,[R5],#4
L3	ADD R6,R6,#1
	CMP R6,#5
	BNE L4
	

DAT	DD 3,4,5,8,9
	END
 

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