Question: Pre lab only the question? Lab 6-Look-Up Tables Objectives: Use a look-up table to store data Use indexed addressing mode to access data in a
Lab 6-Look-Up Tables Objectives: Use a look-up table to store data Use indexed addressing mode to access data in a look-up table Reference: Mazidi Chapter 2 (indexed addressing mode Mazidi Chapter 6 (look-up tables 1 Background 1.1 Indexed Addressing Suppose that R1 is a label for an address. If you wanted to load the contents of R1 into register A, you would use the instruction LDAA RI But suppose you want to load the contents of the address 3 bytes beyond R1 (for example, if R1 is $1002 and you want to load the contents at $1005). Or you want to load the contents of the memory location just before R1. In cases like these, indexed addressing is useful Indexed addressing can be used with any of the load instructions (LDAA, LDAB, etc.) and has the general form: LDA
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