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TS80C31X2-VIA 데이터시트(PDF) 9 Page - ATMEL Corporation |
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TS80C31X2-VIA 데이터시트(HTML) 9 Page - ATMEL Corporation |
9 / 42 page 9 4428E–8051–02/08 AT/TS80C31X2 7. 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 7-1). Figure 7-1. Use of Dual Pointer Reset Value = XXXX XXX0 Not bit addressable Table 7-1. AUXR1: Auxiliary Register 1 7 6 5 4 3 2 1 0 - -3 - - - - - 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 - Reserved The value read from this bit is indeterminate. Do not set this bit. 2 - Reserved The value read from this bit is indeterminate. Do not set this bit. 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. External Data Memory AUXR1(A2H) DPS DPH(83H) DPL(82H) 0 7 DPTR0 DPTR1 |
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