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ECE3120: Computer Systems Shift and Rotation

Prev:LoopsToday:Shift and Rotation. Shift and Rotate InstructionsThe 68HCS12 has shift and rotate instructions that apply to a memory location, accumulators A, B and D. A memory operand must be specified using the extended or index addressing modes. Logical ShiftShift Left (Memory,A,B

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ECE3120: Computer Systems Shift and Rotation

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    1. ECE3120: Computer Systems Shift and Rotation Dr. Xubin He http://iweb.tntech.edu/hexb Email: hexb@tntech.edu Tel: 931-3723462, Brown Hall 319

    2. Prev: Loops Today: Shift and Rotation

    4. Logical Shift

    5. Arithmetic Shift

    6. Rotation (Cyclic Shift)

    13. Bit Test and Manipulate Instruction Bclr,bita,bitb,bset Examples: Bclr 0,x,$81 Bita #$44 Bitb #$22 Bset 0,y,$33

    17. Chapter Review Assembly Language Program Structure: Label, operation, operand, comment Directives: end,org,db,ds,fill Flow chart Arithmetic Loops, branch instructions Shift and rotate Boolean logic Bit test and manipulate Program execution time

    18. Now, you should be able to: Allocate memory blocks, define constants, and create a message using assembler directives Write assembly programs to perform simple arithmetic operations Write loops to perform repetitive operations Use loops to creat time delays Use boolean and bit manipulation instructions to perform bit field operations.

    19. Next: Work examples Chapter 3

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