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CC2430-RTR1-F64Z 数据表(PDF) 41 Page - Texas Instruments |
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CC2430-RTR1-F64Z 数据表(HTML) 41 Page - Texas Instruments |
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41 / 234 page  CC2430 CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A Page 41 of 232 12.3.3 Data Pointers The CC2430 has two data pointers, DPTR0 and DPTR1 to accelerate the movement of data blocks to/from memory. The data pointers are generally used to access CODE or XDATA space e.g. MOVC A,@A+DPTR MOV A,@DPTR. The data pointer select bit, bit 0 in the Data Pointer Select register DPS, chooses which data pointer shall be the active one during execution of an instruction that uses the data pointer, e.g. in one of the above instructions. The data pointers are two bytes wide consisting of the following SFRs: • DPTR0 – DPH0:DPL0 • DPTR1 – DPH1:DPL1 DPH0 (0x83) – Data Pointer 0 High Byte Bit Name Reset R/W Description 7:0 DPH0[7:0] 0 R/W Data pointer 0, high byte DPL0 (0x82) – Data Pointer 0 Low Byte Bit Name Reset R/W Description 7:0 DPL0[7:0] 0 R/W Data pointer 0, low byte DPH1 (0x85) – Data Pointer 1 High Byte Bit Name Reset R/W Description 7:0 DPH1[7:0] 0 R/W Data pointer 1, high byte DPL1 (0x84) – Data Pointer 1 Low Byte Bit Name Reset R/W Description 7:0 DPL1[7:0] 0 R/W Data pointer 1, low byte DPS (0x92) – Data Pointer Select Bit Name Reset R/W Description 7:1 - 0x00 R0 Not used 0 DPS 0 R/W Data pointer select. Selects active data pointer. 0 : DPTR0 1 : DPTR1 12.3.4 XDATA Memory Access The CC2430 provides an additional SFR register MPAGE. This register is used during instructions MOVX A,@Ri and MOVX @Ri,A. MPAGE gives the 8 most significant address bits, while the register Ri gives the 8 least significant bits. In some 8051 implementations, this type of XDATA access is performed using P2 to give the most significant address bits. Existing software may therefore have to be adapted to make use of MPAGE instead of P2. |
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