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參數(shù)資料
| 型號： | AT83C51RB2XXX-SLSIL |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontroller |
| 中文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 12/81頁 |
| 文件大?。?/td> | 1082K |
| 代理商： | AT83C51RB2XXX-SLSIL |
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13
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
Dual Data Pointer
Register
The additional data pointer can be used to speed up code execution and reduce code
size.
The dual DPTR structure is a way by which the chip will specify the address of an exter-
nal data memory location. There are two 16-bit DPTR registers that address the external
memory, and a single bit called DPS = AUXR1.0 (see Table 6) that allows the program
code to switch between them (Refer to Figure 4).
Figure 4.
Use of Dual Pointer
Table 6.
AUXR1 Register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value: XXXX XXXX0b
Not bit addressable
Note:
1. Bit 2 stuck at 0; this allows to use INC AUXR1 to toggle DPS without changing GF3.
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
7
6
5
4
3
2
1
0
-
-
-
-
GF3
0
-
DPS
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
GF3
This bit is a general purpose user flag.
2
0
Always cleared
(1)
.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
DPS
Data Pointer Selection
Cleared to select DPTR0.
Set to select DPTR1.
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PDF描述 |
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| AT83C51RB2XXX-SLSIM | Microcontroller |
| AT83C51RC2XXX-3CSCM | Microcontroller |
| AT83C51RC2XXX-3CSIM | Microcontroller |
| AT83C51RC2XXX-RLTIL | Microcontroller |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT83C51RB2XXX-SLSIM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Microcontroller |
| AT83C51RC2 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT83C51RC2-3CSUL | 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT83C51RC2-3CSUM | 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT83C51RC2-RLTUL | 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller |
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