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TS80C31X2-MCA Datasheet(PDF) 10 Page - ATMEL Corporation

No. de pieza TS80C31X2-MCA
Descripción Electrónicos  8-bit CMOS Microcontroller ROMless
Download  42 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TS80C31X2-MCA Datasheet(HTML) 10 Page - ATMEL Corporation

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10
4428E–8051–02/08
AT/TS80C31X2
8.
Application
Software can take advantage of the additional data pointers to both increase speed and reduce
code size, for example, block operations (copy, compare, search ...) are well served by using
one data pointer as a ’source’ pointer and the other one as a "destination" pointer.
ASSEMBLY LANGUAGE
; Block move using dual data pointers
; Destroys DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
AUXR1 EQU 0A2H
;
0000 909000
MOV
DPTR,#SOURCE
; address of SOURCE
0003 05A2
INC
AUXR1
; switch data pointers
0005 90A000
MOV
DPTR,#DEST
; address of DEST
0008
LOOP:
0008 05A2
INC
AUXR1
; switch data pointers
000A E0
MOVX A,@DPTR
; get a byte from SOURCE
000B A3
INC
DPTR
; increment SOURCE address
000C 05A2
INC
AUXR1
; switch data pointers
000E F0
MOVX @DPTR,A
; write the byte to DEST
000F A3
INC
DPTR
; increment DEST address
0010 70F6
JNZ
LOOP
; check for 0 terminator
0012 05A2
INC
AUXR1
; (optional) restore DPS
INC is a short (2 bytes) and fast (12 clocks) way to manipulate the DPS bit in the AUXR1 SFR.
However, note that the INC instruction does not directly force the DPS bit to a particular state,
but simply toggles it. In simple routines, such as the block move example, only the fact that DPS
is toggled in the proper sequence matters, not its actual value. In other words, the block move
routine works the same whether DPS is '0' or '1' on entry. Observe that without the last instruc-
tion (INC AUXR1), the routine will exit with DPS in the opposite state.


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