8051 Program – hex to bcd 12bit

; 12bit hex to bcd conversion
; input: R6 (MSB) & R7 (LSB)
;output: R0 (MSB) & R1 (LSB)
; step1:convert HEX LSB (R7) to BCD
; step2:check if the HEX MSB (R6) is 0
;if not zero we add 256 to the BCD
;decrement the HEX MSB (R6) until it becomes zero
	ORG 0H
	HEX_ADDR EQU 4000H
MAIN:
	MOV R7,#0Ah
	MOV R6,#0BCh
	LCALL CONV
	SJMP MAIN
CONV:
	MOV R0,#00H
	MOV R1,#00H
	CLR C
	MOV A,R7
	MOV B,#100	;divide LSB by 100
	DIV AB
	MOV R0,A	;save the 100th place
	MOV A,B
	MOV B,#10	;divide LSB by 10
	CLR C
	DIV AB
	SWAP A
	ORL A,B
	MOV R1,A	;save the units & tenth place
	MOV A,R6
	CJNE A,#00h,conv_msb	;check if the MSB is 0 if not then continue
	SJMP return
;add 256 to the BCD number & decrement the HEX MSB by 1 until it becomes 0
conv_msb:
	CLR C
	MOV A,R1
	ADD A,#56H
	DA A
	MOV R1,A
	JNC d3
	CLR C
	MOV A,R0
	ADD A,#01H
	DA A
	MOV R0,A
d3:
	CLR C
	MOV A,R0
	ADD A,#02H
	DA A
	MOV R0,A
	DJNZ r6,conv_msb
return:	RET
	END

---

<< Previous :: Up :: Next >>

---

Related topics:
8051 Program - decimal to hex   |   8051 Program - hex to decimal 8bit   |   8051 Program - decimal to ascii   |   8051 Program - ascii to decimal   |   8051 Program - hex to ascii   |   8051 Program - ascii to hex   |   8051 Program - bcd to ascii   |   8051 Program - ascii to bcd   |   8051 Program - bcd to hex 8bit   |   8051 Program - hex to bcd 8bit   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

---

List of topics: 8051

---