8051 Program – decimal to hex

;decimal to hex conversion
; dec: 4000H
; hex: 4001H
	ORG 0H
	DATA_ADDR EQU 4000H
MAIN:
	MOV DPTR,#DATA_ADDR
	MOV A,#99
	MOVX @DPTR,A
	LCALL CONV
	SJMP MAIN
CONV:
	MOV DPTR,#DATA_ADDR	; Load DATA_ADDR into dptr register
	MOVX A,@DPTR	; move data from external memory location to a
	MOV R2,A	;move data from r2 to a
	CLR C	;clear carry bit
	SUBB A,#0AH	;subtract with borrow, 0ah from a
	JC over	;if carry, jump to label over
	MOV A,R2	;move data from r2 to a
	ANL A,#0F0H	;and a with 0f0h
	SWAP A	;swap a
	MOV B,#0AH	;move 0ah to b
	MUL AB	;multiply and b
	MOV R3,A	;move data from a to r3
	MOV A,R2	;move data from r2 to a
	ANL A,#0FH	;move 0fh to a
	ADD A,R3	;add a and r3
	INC DPTR	;increment dptr
	MOVX @DPTR,A	;move data from a to external memory location
	SJMP here
over:	MOV A,R2	;move data from r2 to a
	INC DPTR	;increment dptr
	MOVX @DPTR,A	;move data from a to external memory location
here:
	RET
	END

; decimal to hex
	ORG 0H
	MOV R0,#16	;R0=Input byte
	MOV A,R0
	ANL A,#0F0h
	SWAP A
	MOV B,#0Ah
	MUL AB
	MOV R1,A
	MOV A,R0
	ANL A,#0Fh
	ADD A,R1
	MOV R1,A	;R1=Output byte
	SJMP $
	END

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List of topics: 8051

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