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STC89C53RC Fiches technique(PDF) 35 Page - STCmicro Technology Co,.Ltd

No de pièce STC89C53RC
Description  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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Fabricant  STC [STCmicro Technology Co,.Ltd]
Site Internet  http://www.stcmicro.com/
Logo STC - STCmicro Technology Co,.Ltd

STC89C53RC Fiches technique(HTML) 35 Page - STCmicro Technology Co,.Ltd

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The following program is an assembly program that demostrates how the dual data pointer be used.
AUXR1
DATA
0A2H
;Define special function register AUXR1
MOV
AUXR1, #0
;DPS=0, select DPTR0
MOV
DPTR,
#1FFH
;Set DPTR0 for 1FFH
MOV
A,
#55H
MOVX
@DPTR, A
;load the value 55H in the 1FFH unit
MOV
DPTR,
#2FFH
;Set DPTR0 for 2FFH
MOV
A,
#0AAH
MOVX
@DPTR, A
;load the value 0AAH in the 2FFH unit
INC
AUXR1
;DPS=1, DPTR1 is selected
MOV
DPTR,
#1FFH
;Set DPTR1 for 1FFH
MOVX
A,
@DPTR
;Get the content of 1FFH unit
;which is pointed by DPTR1,
;the content of Accumulator has changed for 55H
INC
AUXR1
;DPS=0, DPTR0 is selected
MOVX
A,
@DPTR
;Get the content of 2FFH unit
;which is pointed by DPTR0,
;the content of Accumulator has changed for 0AAH
INC
AUXR1
;DPS=1, DPTR1 is selected
MOVX
A,
@DPTR
;Get the content of 1FFH unit
;which is pointed by DPTR1,
;the content of Accumulator has changed for 55H
INC
AUXR1
;DPS=0, DPTR0 is selected
MOVX
A,
@DPTR
;Get the content of 2FFH unit
;which is pointed by DPTR0,
;the content of Accumulator has changed for 0AAH
35



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