TS83C51U2 查看數據表（PDF） - Atmel Corporation

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TS83C51U2

Double UART 8-bit CMOS Microcontroller

Atmel Corporation 

TS80C51U2

TS83C51U2

TS87C51U2

7.2 Dual Data Pointer Register Ddptr

The additional data pointer can be used to speed up code execution and reduce code size in a number of

ways.

The dual DPTR structure is a way by which the chip will specify the address of an external 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).

External Data Memory

7

0

DPS

AUXR1(A2H)

DPTR1

DPTR0

DPH(83H) DPL(82H)

Figure 3. Use of Dual Pointer

Rev. D - 15 January, 2001

11

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