80C54 데이터 시트보기 (PDF) - Atmel Corporation

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80C54

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

Atmel Corporation 

AT/TS8xC54/8X2

7. 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 7-1.) that allows the program code to switch between them

(Refer to Figure 7-1).

Figure 7-1. Use of Dual Pointer

External Data Memory

7

0

DPS

AUXR1(A2H)

DPTR1

DPTR0

DPH(83H) DPL(82H)

11

4431E–8051–04/06

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