8051 Program - multiply dptr by 10

; Description:

; Multiply DPTR By 10. Return CY == 1 If Overflow

;

; Entry Requirements:

; DPTR Has Value To Multiply By 10

;

; On Exit:

; DPTR = DPTR * 10

;

; Affected:

; PSW.CY, DPTR

;

; Stack:

; 3 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

UTIL_DPTRX10:
	push b	; Save B
	push acc	; Save Acc
	mov a,dpl	; Get Low Of Value
	mov b,#10	; Multiplier
	mul ab	; BA = DPL * 10
	mov dpl,a	; Move Low Back To DPL
	push b	; Save High Side
	mov a,dph	; Get High Of Value
	mov b,#10	; Multiplier
	mul ab	; BA = DPH * 10
	pop b	; Recover B
	add a,b	; Add To Low
	mov dph,a	; Move Back To DPH
	pop acc	; Recover Acc
	pop b	; Recover B
	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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