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HD404339FS датащи(PDF) 16 Page - Renesas Technology Corp |
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HD404339FS датащи(HTML) 16 Page - Renesas Technology Corp |
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16 / 80 page ![]() HD404339 Series 14 Addressing Modes RAM Addressing Modes Register Indirect Addressing Mode: The contents of the W, X, and Y registers (10 bits 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 (LAMR, XMRA): The memory registers (MR), which are located in 16 addresses from $040 to $04F, are accessed with the LAMR and XMRA instructions. 0 0 9 9 Opcode Register Indirect Addressing 2nd instruction word RAM address Direct Addressing Instruction 9 0 0 9 RAM address 1st instruction word 3 7 30 Memory Register Addressing 0 9 RAM address 000100 Opcode Instruction 30 30 0 1 W X Y Figure 7 RAM Addressing Modes |
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