Monday, May 30, 2016

8051 Program - exchange r0r1 and dptr

; Description:
; Exchange R0/1 And DPTR
;
; Entry Requirements:
; DPTR Has 1st Value
; R0/1 Has 2nd Value
;
; On Exit:
; DPTR <-> R0/1
;
; Affected:
; DPTR, R0, R1
;
; Stack:
; 1 Bytes, Not Including Space Used By Called Routines
;
; Comments:
; None
UTIL_DPTRR01:
push acc ; Save Acc
mov a,dpl ; Get DPL
mov dpl,r1 ; Move R1 To DPL
mov r1,a ; Move DPL To R1
mov a,dph ; Get DPL
mov dph,r0 ; Move R0 To DPH
mov r0,a ; Move DPH To R0
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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