TS87C54X2-LCA Ver la hoja de datos (PDF) - Atmel Corporation

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Fabricante

TS87C54X2-LCA

8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP

Atmel Corporation 

TS80C54X2/C58X2

TS87C54X2/C58X2

6.2 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

10

Rev. C - 15 January, 2001

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