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参数资料
| 型号： | AT83C5112 |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-bit Microcontroller with A/D Converter |
| 中文描述： | 8位微控制器与A / D转换器 |
| 文件页数： | 26/97页 |
| 文件大小： | 1229K |
| 代理商： | AT83C5112 |
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26
AT8xC5112
4191B
–
8051
–
04/03
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 "destina-
tion" 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
0005 90A000 MOV DPTR,#DEST ; address of DEST
0008
LOOP:
0008 05A2 INC AUXR1
000A E0 MOVX A,atDPTR
000B A3 INC DPTR
000C 05A2 INC AUXR1
000E F0 MOVX atDPTR,A
000F A3 INC DPTR
0010 70F6JNZ LOOP
0012 05A2 INC AUXR1
; switch data pointers
; switch data pointers
; get a byte from SOURCE
; increment SOURCE address
; switch data pointers
; write the byte to DEST
; increment DEST address
; check for 0 terminator
; (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 par-
ticular 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 instruction (INC AUXR1), the routine will exit with DPS in
the opposite state.
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| AT83C5121XXX-PURUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Multiprotocol Smart Card Interface |
| AT83C5121XXX-PUTUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Multiprotocol Smart Card Interface |
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