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AT89C51ID2-RDTIM Datasheet(PDF) 26 Page - ATMEL Corporation

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 26 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
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 22) that allows the program
code to switch between them (Refer to Figure 6).
Figure 6. Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1



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