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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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TMS320F bảng dữ liệu(PDF) 88 Page - Texas Instruments |
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TMS320F bảng dữ liệu(HTML) 88 Page - Texas Instruments |
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88 / 389 page  Direct Addressing Mode 6-4 6.2 Direct Addressing Mode In the direct addressing mode, data memory is addressed in blocks of 128 words called data pages. The entire 64K of data memory consists of 512 data pages labeled 0 through 511, as shown in Figure 6–3. The current data page is determined by the value in the 9-bit data page pointer (DP) in status register ST0. For example, if the DP value is 0 0000 00002, the current data page is 0. If the DP value is 0 0000 00102, the current data page is 2. Figure 6–3. Pages of Data Memory 1111 1111 1 0000 0000 1 0000 0001 0 0000 0001 0 0000 0000 0 Data Memory Page 0: 0000h–007Fh Page 1: 0080h–00FFh Page 2: 0100h–017Fh Page 511: FF80h–FFFFh . 000 0000 Offset DP Value 0000 0000 0 111 1111 0000 0000 1 1111 1111 1 000 0000 111 1111 000 0000 111 1111 000 0000 111 1111 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In addition to the data page, the processor must know the particular word being referenced on that page. This is determined by a 7-bit offset (see Figure 6–3). The offset is supplied by the seven least significant bits (LSBs) of the IR regis- ter shown in Figure 6–4, Instruction Register (IR) Contents in Direct Address- ing Mode instruction register, on page 6-5, which holds the opcode for the next instruction to be executed. In direct addressing mode, the contents of the instruction register has the format. |
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