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TS80C31X2-LLAR Datasheet(PDF) 9 Page - ATMEL Corporation |
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TS80C31X2-LLAR Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 42 page 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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