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TS80C31X2-VCBD データシート(PDF) 9 Page - ATMEL Corporation

部品番号 TS80C31X2-VCBD
部品情報  8-bit CMOS Microcontroller ROMless
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TS80C31X2-VCBD データシート(HTML) 9 Page - ATMEL Corporation

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Rev. C - 15 January, 2001
9
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).
Figure 3. Use of Dual Pointer
External Data Memory
AUXR1(A2H)
DPS
DPH(83H) DPL(82H)
0
7
DPTR0
DPTR1


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