Monday, May 30, 2016

8051 Program - load dptr from (dptr) xram

; Description:
; Load DPTR From DPTR In External Memory Space
;
; Entry Requirements:
; DPTR Points To 16 Bit Value In External Memory Space To Load
;
; On Exit:
; DPTR = (DPTR)
;
; Affected:
; DPTR
;
; Stack:
; 2 Bytes, Not Including Space Used By Called Routines
;
; Comments:
; None
UTIL_LDDPTRD:
push acc ; Save Acc
movx a,@dptr ; Get High Byte
push acc ; Save It
inc dptr ; Point To Low Byte
movx a,@dptr ; Get Low Byte
mov dpl,a ; Move To DPL
pop dph ; Recover High To DPH
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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