8051 Program - copy iram to xram

; Description:

; Copy Bytes From Internal Memory To External Memory

;

; Entry Requirements:

; DPTR Points To Destination In External Memory

; R1 Points To Source In Internal Memory

; R0 Contains Number Of Bytes To Copy

;

; On Exit:

; DPTR = Points To End Of Destination + 1

; R1 Points To End Of Source + 1

; R0 = 0

;

; Affected:

; PSW.Z, PSW.P, Acc, R0, R1, DPTR

;

; Stack:

; 0 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

UTIL_COPYITOX:
loop1:	mov a,@r1	; Get Source Byte
	movx @dptr,a	; Store To Destination
	inc r1	; Next Source Byte
	inc dptr	; Next Destination Byte
	djnz r0,loop1	; Do For R0 Bytes
	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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