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T87C5101-ICFIL Datasheet(PDF) 10 Page - ATMEL Corporation |
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T87C5101-ICFIL Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 58 page 10 T8xC5101/02 4233H–8051–02/08 Dual Data Pointer Register (DPTR) 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 exter- nal 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 3.) that allows the pro- gram code to switch between them (Refer to Figure 3). Figure 3. Use of Dual Pointer Table 3. AUXR1: Auxiliary Register 1 Notes: 1. User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new feature. In that case, the reset value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. 2. GF3 will not be available on first version of the RC devices. External Data Memory AUXR1(A2H) DPS DPH(83H) DPL(82H) 0 7 DPTR0 DPTR1 (On chip XRAM) AUXR1 Address 0A2H - - - - GF3 0 - DPS Reset value X X X X 0 0 X 0 Symbol Function - Not implemented, reserved for future use. DPS Data Pointer Selection. DPS Operating Mode(1) 0 DPTR0 Selected 1 DPTR1 Selected GF3 This bit is a general purpose user flag(2) |
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