8051 Program – ascii to hex

ASCII codes 30 to 39 represent 0 to 9 in binary and 41 to 46 represent A to F. Therefore if the ASCII code is between 30-39h then 30h is subtracted from the code. If the number lies between A to F then 37h is subtracted from the code to get its binary equivalent.

; ascii to hex conversion
; input: 4000H
; output: 4001H
	ORG 0H
	ASCII_ADDR EQU 4000H
	HEX_ADDR EQU 4001H
MAIN:
	MOV DPTR,#ASCII_ADDR	; fill memory
	MOV A,#0AH
	MOVX @DPTR,A
	LCALL CONV
	SJMP MAIN
CONV:
	MOV DPTR,#ASCII_ADDR
	MOVX A,@DPTR
	MOV R0,A
	SUBB A,#0AH
	JNC loop1
	MOV A,R0
	ADD A,#30H
	SJMP loop
loop1:	MOV A,R0
	ADD A,#37H
loop:	MOV DPTR,#HEX_ADDR
	MOVX @DPTR,A
	RET
	END

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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 - bcd to ascii   |   8051 Program - ascii to bcd   |   8051 Program - bcd to hex 8bit   |   8051 Program - hex to bcd 8bit   |   8051 Program - hex to bcd 12bit   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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