參數(shù)資料
型號(hào): T89C51RD2-SLSCM
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 13/104頁
文件大小: 798K
代理商: T89C51RD2-SLSCM
13
T89C51RD2
4243G
8051
05/03
Dual Data Pointer
Register Ddptr
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/bit0 (See Table 5.) that allows the program code to switch between them
(Refer to Figure 3).
Figure 3.
Use of Dual Pointer
Table 5.
AUXR1: Auxiliary Register 1
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1
AUXR1
Address 0A2H
-
-
-
-
GF3
0
-
DPS
Reset value
X
X
X
X
0
0
X
0
Symbol
Function
-
Not implemented, reserved for future use.
(1)
1.
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.
2. Bit 2 stuck at 0; this allows to use INC AUXR1 to toggle DPS without changing GF3.
DPS
Data Pointer Selection.
DPS
Operating Mode
0
DPTR0 Selected
1
DPTR1 Selected
GF3
This bit is a general purpose user flag
(2)
.
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