8051 Program - convert acc to uppercase

; Description:

; Convert Character In Acc To Upper Case

;

; Entry Requirements:

; Acc Has Character To Convert To Upper Case

;

; On Exit:

; Acc Has Upper Case Character, Or Original If Not A..Z Range

;

; Affected:

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

;

; Stack:

; X Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

UTIL_TOUPPER:
	cjne a,#'a',loop1	; If < 'a', Don't Change
loop1:	jc loop3	; end if acc < 97
	cjne a,#'z',loop2	; If > 'z', Don't Change
	jmp conv	;
loop2:	jnc loop3	; end if acc >= 123
conv:	clr c	; Clear For Subtract
	subb a,#'a'-'A'	; Make Upper Case
loop3:	ret	; Return To Caller

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

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Related topics:
8051 Program - convert acc to lowercase   |   8051 Program - call function dptr points to   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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