TS80C54 ATMEL [ATMEL Corporation], TS80C54 Datasheet - Page 11

• Manufacturer Part Number: TS80C54
• Description: 8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP
• Manufacturer: ATMEL [ATMEL Corporation]

7. Dual Data Pointer Register Ddptr
4431E–8051–04/06
7
AUXR1(A2H)
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.
DPS
0
Use of Dual Pointer
DPH(83H) DPL(82H)
DPTR1
DPTR0
External Data Memory
AT/TS8xC54/8X2
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