8051 Program - add ba to dptr

; Description:

; Add B/Acc To DPTR, Setting Carry If DPTR Overflows

;

; Entry Requirements:

; DPTR Has Value

; 'B' Has High Of Value To Add, Acc Has Low Of Value To Add

;

; On Exit:

; DPTR = DPTR + B/Acc, CY Set Accordingly

;

; Affected:

; PSW.CY, DPTR

;

; Stack:

; 1 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; Value Of CY On Entry Does Not Affect Result

;

UTIL_ADCBAD:
	push acc	; Make Sure Acc Gets Saved
	add a,dpl	; Add 'A' To DPL
	mov dpl,a	; Move Result To DPL
	mov a,dph	; Get DPH
	addc a,b	; Add 'B' To DPH + CY
	mov dph,a	; Move Bck To DPH
	pop acc	; Recover Original 'A'
	ret	; Return To Caller

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

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List of topics: 8051

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