TS80C32X2 ATMEL Corporation, TS80C32X2 Datasheet - Page 9

• Manufacturer Part Number: TS80C32X2
• Description: 8-bit Microcontroller ROMless
• Manufacturer: ATMEL Corporation

TS80C31X2
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
DPTR1
DPTR0
AUXR1(A2H)
DPH(83H) DPL(82H)
Figure 3. Use of Dual Pointer
Rev. C - 15 January, 2001
9