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# Lab 4 - 3 In a single loop a Add together all the original...

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Introduction This lab shows us how to do various arithmetic operations using signed numbers on the Motorola 68HC12 microcontroller including one’s and two’s complements, sign/magnitude conversions, and we also do many conversions from 8-bit to 16-bit numbers. Equipment • 68HC12 evaluation board • MiniIDE and its respective requirements Procedure 1. Enter relevant data into memory at location \$1000 2. In a single loop: a. Negate this data via sign/magnitude and store it at location \$1020 i. Take each number and add %1000 0000 0000 0000 (or \$8000). b. Negate via one’s complement and store at \$1040 i. Load into Accumulator D ii. Request COMA and COMB operations c. Negate via two’s complement and store at \$1060 i. Add 1 to the one’s complement from before with ADDD #01
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Unformatted text preview: 3. In a single loop: a. Add together all the original positive numbers and store at location \$1080 b. Add together all the one’s complement numbers and store at \$1084 4. Add up the sign/magnitude numbers assuming the first 4 are negative and the rest are positive. a. After loading a number into Accumulator D, ensure that it is negative with the command ORAA #%1000 0000 or positive with the command ANDA #%0111 1111. These commands will set the most significant bit appropriately while leaving all other bits in Accumulator D alone. 5. Do to sets of custom operations, one using one’s complements and the other using two’s complements. Store them at \$1086 and \$1088 respectively. Results Results are shown on the following page in the screenshot....
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• Fall '06
• FernandoRios-Guiterrez
• Signed number representations, single loop, various arithmetic operations, respective requirements Procedure

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