8051 Program - byte to ascii

; Returns the ASCII codes from the nibbles of a byte stored in the Acc.
; After being called the high nibble is in the Acc and the low nibble
; is in the B register.
; ;usage:
; mov a, #byte
; CALL nibble
; ;returns
; ;A= high nibble
; ;B= low nibble
nibble:
	mov b,a	; b=a ; stores Acc in B
	anl a,#0f0h	; a=xxxx0000 ; A && #f0h (get the high nibble)
	swap a	; a=0000xxxx ; swap nibbles
	orl a,#30h	; a=0011xxxx ; add #30h, if nibble is
	push acc	; 0-9 we have the ASCII value
	push b	; stores A and B
	mov b, #3ah	; stores #3ah in B
	div ab	; divide A/#3ah
	jz recupera1	; if zero, nibble < #0Ah
nibble1_ok:
	pop b	; recover B
	pop acc	; recover A
	add a, #07h	; adds #07h to get ASCII of A-F
	xch a,b
	jmp nibble2
recupera1:
	pop b	; stores B
	pop acc	; stores A
	xch a,b
nibble2:
	anl a,#0fh	; a=0000xxxx ; A && #0fh (get low nibble)
	orl a,#30h	; a=0011xxxx ; add #30h, if nibble is
	push acc	; 0-9 we have the ASCII value
	push b	; stores A and B
	mov b, #3ah	; stores #3ah in B
	div ab	; divide A/#3ah
	jz recupera2	; if zero, nibble < #0Ah
	pop b	; recover B
	pop acc	; recover A
	add a, #07h	; adds #07h to get ASCII of A-F
	xch a,b
	ret	; return to main routine
recupera2:
	pop b	; recover B
	pop acc	; recover A
	xch a,b
	ret	; return to main routine

Byte2ascii:
	mov b, a
	swap a
	acall Nibble2ascii
	xch a, b
Nibble2ascii:
	anl a, #00fh
	inc a
	movc a, @a+pc
	ret
ascii:	DB "0123456789ABCDEF"

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Related topics:
8051 Program - 16 bit hex to bcd   |   8051 Program - bcd byte   |   8051 Program - 16 bit binary to ascii   |   8051 Program - 5 digit decimal to binary   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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