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The LC-3 ISA. A.1 Overview. The Instruction Set Architecture (ISA) of the LC-3 is defined as follows: Memory address space 16 bits, corresponding to 216 locations, each containing one word (16 bits). Addresses are numbered from 0 (i.e, x0000) to 65,535 (i.e., xFFFF). Addresses are used to identify memory locations.
?PC (program counter), condition codes, MAR, MDR, etc. 5-4. CSE 240. LC-3 Overview: Instruction Set. Opcodes. • 16 opcodes. • Operate instructions: ADD, AND, NOT, (MUL). • Data movement instructions: LD, LDI, LDR, LEA, ST, STR, STI. • Control instructions: BR, JSR, JSRR, RET, RTI, TRAP. • Some opcodes set/clear
Aug 4, 2005 takes three instructions, creating a need for further clarity through commenting. Line 3 contains the .ORIG pseudo-op. A pseudo-op is an instruction that you can use when writing LC-3 assembly programs, but there is no corresponding instruction in LC-3's instruction set. All pseudo-ops start with a period.
Opcodes. 15 opcodes. Operate instructions: ADD, AND, NOT. Data movement instructions: LD, LDI, LDR, LEA, ST, STR, STI. Control instructions: BR, JSR/JSRR, JMP, RTI, TRAP some opcodes set/clear condition codes, based on result: N = negative, Z = zero, P = positive (> 0). Data Types. 16-bit 2's complement integer.
LC-3 Instruction Set Architecture. CMPE12 – Summer 2008 – Slides by ADB. 2. Instruction set architecture. ? What is an instruction set architecture (ISA)?. ? It is all of the programmer-visible components and operations of the computer. ? The ISA provides all the information needed for someone to write a program in
Jun 15, 2006 There are 15 instructions in LC-3 assembly language. They are separated into three different categories: operation, data movement, and finally, control. Please note: more advanced instructions such as TRAP, will be covered in a later tutorial. Operation Instructions ADD - Destination , Source , Source
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LC-3 Instructions. Page 4 of 16. 1. Operate instructions. ADD. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0. 0 0 0 1. DR. SR1 0 0 0. SR2. 0 0 0 1. DR. SR1 1 imm5 if (bit[5] == 0). DR = SR1 + SR2 else. DR = SR1 + sign-extend(imm5) set cc(DR). Example: ADD R2, R3, R4. ; R2 < R3 + R4. ADD R2, R3, #7. ; R2 < R3 + 7. AND.
The LC-3 instruction set implements fifteen types of instructions, with a sixteenth opcode reserved for later use. The architecture is a load-store architecture; values in memory must be brought into the register file before they can be operated upon. Arithmetic instructions available include
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