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AT89C51ED2-RDTIM 数据表(PDF) 21 Page - ATMEL Corporation

部件名 AT89C51ED2-RDTIM
功能描述  8-bit Flash Microcontroller
PDF  137 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM 数据表(HTML) 21 Page - ATMEL Corporation

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21
AT89C51RD2/ED2
4235E–8051–04/04
Dual Data Pointer
Register (DPTR)
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 18) that allows the program
code to switch between them (Refer to Figure 7).
Figure 7. Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1



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