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TS87C52X2-VCC датащи(PDF) 10 Page - ATMEL Corporation |
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TS87C52X2-VCC датащи(HTML) 10 Page - ATMEL Corporation |
10 / 55 page 10 TS8xCx2X2 4184I–8051–02/08 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 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 5.) that allows the program code to switch between them (Refer to Figure 3). Figure 3. Use of Dual Pointer Table 4. AUXR1: Auxiliary Register 1 Reset Value = XXXX XXX0 Not bit addressable External Data Memory AUXR1(A2H) DPS DPH(83H) DPL(82H) 0 7 DPTR0 DPTR1 7 6 5 4 3 2 1 0 - - - - GF3 0 - DPS Bit Number Bit Mnemonic Description 7 - Reserved The value read from this bit is indeterminate. Do not set this bit. 6 - Reserved The value read from this bit is indeterminate. Do not set this bit. 5 - Reserved The value read from this bit is indeterminate. Do not set this bit. 4 - Reserved The value read from this bit is indeterminate. Do not set this bit. 3 GF3 This bit is a general purpose user flag 2 0 Reserved Always stuck at 0 1 - Reserved The value read from this bit is indeterminate. Do not set this bit. 0 DPS Data Pointer Selection Clear to select DPTR0. Set to select DPTR1. |
Аналогичный номер детали - TS87C52X2-VCC |
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Аналогичное описание - TS87C52X2-VCC |
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