8051 Program - copy xram to xram string

; Description:

; Copies ETX Terminated String From External Memory To External Memory.

; ETX Is Copied.

;

; Entry Requirements:

; DPTR Points To Destination In External Memory

; R6/7 Points To Source In Code Memory

;

; On Exit:

; DPTR = Points To Source ETX + 1

; R6/7 = Points To Destination ETX + 1

;

; Affected:

; PSW.Z, PSW.P, Acc, DPTR, R6, R7

;

; Stack:

; 2 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

	ETX equ 3	; ASCII ETX Character
UTIL_COPYDTODZ:
loop1:	call UTIL_DPTRR67	; DPTR=Src, R67=Dest
	movx a,@dptr	; Get Character
	inc dptr	; Next Source Location
	call UTIL_DPTRR67	; DPTR=Dest, R67=Src
	movx @dptr,a	; Store It
	inc dptr	; Next Destination Location
	cjne a,#ETX,loop1	; If ETX, Exit Copy
	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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