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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HD404612FS 데이터시트(PDF) 72 Page - Renesas Technology Corp |
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HD404612FS 데이터시트(HTML) 72 Page - Renesas Technology Corp |
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72 / 91 page  HD404618 Series 70 Addressing Modes RAM Addressing Modes The MCU has three RAM addressing modes, as shown in figure 44 and described below. Register Indirect Addressing Mode: The contents of the W, X, and Y registers (10 bits in total) are used as a RAM address. Direct Addressing Mode: A direct addressing instruction consists of two words. The first word contains the opcode, and the contents of the second word (10 bits) are used as a RAM address. Memory Register Addressing Mode: The memory registers (MR), consisting of 16 digits from $040 to $04F, are accessed with the LAMR and XMRA instructions. AP 9 AP 8 AP 7 AP 6 AP 5 AP 4 AP 3 AP 2 AP 1 AP 0 W1 W0 X3 X2 X1 X0 Y 3 Y 2 Y 1 Y 0 W register X register Y register RAM address Register Indirect Addressing AP 9 AP 8 AP 7 AP 6 AP 5 AP 4 AP 3 AP 2 AP 1 AP 0 RAM address Direct Addressing d 9 d 8 d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 2nd word of instruction Opcode 1st word of instruction AP 9 AP 8 AP 7 AP AP 5 AP 4 AP 3 AP 2 AP 1 AP 0 RAM address Memory Register Addressing m 3 m 2 m 1 m 0 Opcode Instruction 00 010 0 6 Figure 44 RAM Addressing Modes |
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