1. Computer Science 210 Computer Organization
Machine Language Instructions:
Computation

2. Types of Instructions Operate (computation): NOT, AND, ADD
Data movement: LD, LDR, LDI, LEA, ST, STR, STI
Control: BR, JMP, JSR, JSRR, RET, RTI, TRAP

3. Bitwise NOT RDst  NOT RSrc R3  NOT R5
RDst  NOT RSrc
NOT Dst Src
R3  NOT R5

4. Data Path for NOT RDst  NOT RSrc
NOT Dst Src
RDst  NOT RSrc

5. Bitwise AND (2 flavors) RDst  RSrc1 AND RSrc2 RDst  RSrc1 AND Data
RDst  RSrc1 AND RSrc2
AND Dst Src Src2
RDst  RSrc1 AND Data
AND Dst Src imm5
Data is the sign-extend of imm5
Clear R1

6. ADD (2 flavors) RDst  RSrc1 ADD RSrc2 RDst  RSrc1 ADD Data
RDst  RSrc1 ADD RSrc2
ADD Dst Src Src2
RDst  RSrc1 ADD Data
ADD Dst Src imm5
Data is the sign-extend of imm5
Increment R1

7. Data Path for AND/ADD (register mode)
AND Dst Src Src2
ADD Dst Src Src2
RDst  RSrc1 AND RSrc2
0 bit means register mode
RDst  RSrc1 ADD RSrc2

8. Data Path for AND/ADD (immediate mode)
AND Dst Src imm5
ADD Dst Src imm5
RDst  RSrc1 AND Data
1 bit means immediate mode
RDst  RSrc1 ADD Data

9. Other Useful Operations
Decrement the contents of a given register
Copy the contents of RA to RB
Subtract RB from RA and store the result in RC

10. The LC-3 Simulator Various versions, ours comes from U Texas
Supports assembly, loading of object files, and visualized execution
Next, Step, Finish, Continue, Stop
Can edit PC, registers, and memory

11. Using the Simulator Run /opt/lc3tools/lc3sim-tk
Enter instructions starting at x3000
Set PC to x3000, then Next or Continue

12. Memory access: load and store instructions
For Wednesday
Memory access:
load and store instructions