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T80C5112-RKFEV 数据表(PDF) 28 Page - ATMEL Corporation |
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T80C5112-RKFEV 数据表(HTML) 28 Page - ATMEL Corporation |
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28 / 97 page ![]() 28 Rev. B - November 10, 2000 Preliminary T80C5112 10. 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 17.) that allows the program code to switch between them (Refer to Figure 9). Figure 9. Use of Dual Pointer External Data Memory AUXR1(A2H) DPS DPH(83H) DPL(82H) 0 7 DPTR0 DPTR1 |
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