8051 Program - store r6r7 to dptr xram

; Description:

; Store R6/7 To DPTR In External Memory Space. Return DPTR Pointing To

; Next Location.

;

; Entry Requirements:

; DPTR Contains Location To Store R6/7

; R6/7 Contains Value To Be Stored

;

; On Exit:

; (DPTR) = R6, (DPTR + 1) = R7

;

; Affected:

; None

;

; Stack:

; 1 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; I Often Use R6/7 As A Register Pair That Serves As A Second DPTR,

; So This Is Used To Store R6/7 When Building Lists, Etc.

UTIL_STDPTRD:
	push acc	; Save Acc
	mov a,r6	; Get R6
	movx @dptr,a	; Store High Byte
	inc dptr	; Point To Low Byte
	mov a,r7	; Get R7
	movx @dptr,a	; Store Low Byte
	inc dptr	; Point To Next Location
	pop acc	; Recover Acc
	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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