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參數(shù)資料
| 型號(hào)： | TS80C51RA2-MILD |
| 廠商： | Atmel Corp. |
| 英文描述： | High Performance 8-bit Microcontrollers |
| 中文描述： | 高性能8位微控制器 |
| 文件頁(yè)數(shù)： | 14/74頁(yè) |
| 文件大?。?/td> | 903K |
| 代理商： | TS80C51RA2-MILD |
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14
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6.2. Dual Data Pointer Register Ddptr
The additional data pointer can be used to speed up code execution and reduce code size in a number of
ways.
The dual DPTR structure is a way by which the chip will specify the address of an external data memory
location. There are two 16-bit DPTR registers that address the external memory, and a single bit called
DPS=AUXR1/bit0(SeeTable4.)thatallowstheprogramcodetoswitchbetweenthem(RefertoFigure 3).
Figure 3. Use of Dual Pointer
Table 4. AUXR1: Auxiliary Register 1
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.
AUXR1
Address 0A2H
-
-
-
-
GF3
-
-
DPS
Reset value
X
X
X
X
0
X
X
0
Symbol
Function
Not implemented, reserved for future use.
a
-
a.
User software should not write 1s to reserved bits. These bits may be used in future 8051 family
products to invoke new feature. In that case, the reset value of the new bit will be 0, and its active
value will be 1. The value read from a reserved bit is indeterminate.
GF3 will not be available on first version of the RC devices.
b.
DPS
Data Pointer Selection.
DPS
Operating Mode
0
DPTR0 Selected
1
DPTR1 Selected
GF3
This bit is a general purpose user flag
b
.
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TS80C51RA2-MILR | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MIMB | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MIMD | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:12; Connector Shell Size:28; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Body Style:Straight |
| TS80C51RA2-MIMR | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:12; Connector Shell Size:28; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Body Style:Straight |
| TS80C51RA2-MINB | High Performance 8-bit Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS80C51RA2-MILR | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MIMB | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MIMD | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MIMR | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MINB | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
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