AT89C51RB2-3CSUM Ver la hoja de datos (PDF) - Atmel Corporation

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AT89C51RB2-3CSUM

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

Dual Data Pointer

Register (DPTR)

Figure 7. Use of Dual Pointer

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 17) that allows the program

code to switch between them (see Figure 7).

External Data Memory

7

0

DPS

AUXR1(A2H)

DPTR1

DPTR0

DPH(83H) DPL(82H)

20 AT89C51RB2/RC2

4180E–8051–10/06

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