8051 Program - convert ascii hex to binary

; Description:

; Convert ASCII Value In Acc To Binary. Checks Value To See That It's

; Legal Hex. If Not, Return CY == 1, Else Return Converted Value In

; Acc, And CY == 0.

;

; Entry Requirements:

; Acc Has Character To Convert From ASCII Hex To Binary

;

; On Exit:

; Acc Has Binary Value, Or Original Character If Not Legal ASCII Hex

;

; Affected:

; PSW.CY, PSW.Z, PSW.P, Acc

;

; Stack:

; 2 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

UTIL_HEXTOBIN:
	call UTIL_VALHXDG	; See If Good Digit
	jc loop3	; If Not, Return CY == 1
	subb a,#'0'	; Make 0..16 Range
	cjne a,#9+1,loop1	; See If <= 9
loop1:	jc loop2	; Return Value, It's In Range
	subb a,#7	; Make 00ah..00fh Range
loop2:	clr c	; CY == 0 Means No Error
loop3:	ret	; Return To Caller

Source: Assorted Utilities, John C. Wren 11/23/96

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Related topics:
8051 Program - convert ascii decimal to binary   |   8051 Program - convert bcd value to hex   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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