參數(shù)資料
型號： TS87C51RC2-VIE
廠商： International Rectifier
英文描述： High Performance 8-bit Microcontroller
中文描述： 高性能8位微控制器
文件頁數(shù)： 16/85頁
文件大?。?/td> 762K
代理商： TS87C51RC2-VIE
16
4188E–8051–08/06
AT/TS8xC51Rx2
6.
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 909000MOV 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 70F6JNZ 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.
相關(guān)PDF資料
PDF描述
TS87C51RD2-LCE High Performance 8-bit Microcontroller
TS87C51RD2-LIA High Performance 8-bit Microcontroller
TS87C51RD2-LIB High Performance 8-bit Microcontroller
TS87C51RD2-LIE High Performance 8-bit Microcontroller
TS87C51RD2-MCA High Performance 8-bit Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS87C51RC2-VIEB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS87C51RC2-VIED 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS87C51RC2-VIER 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
TS87C51RD2 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Qualification Package TS87C51RD2 / TS83C51RD2 CMOS 0.5Um
TS87C51RD2-EAD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
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