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Status: Tags: Links: A Instruction (CPU)

C Instruction (CPU)

Chart

!c instruction visual.png

Notes

Performs a compution on a certain destination

• comp is a logical/arithmetic computation !600
• dest refers to RAM[A]
  • null, M, D, MD, A, AM, AD, AMD
• jump is flow control
  • null, JGT, JEQ, JGE, JLT, JNE, JLE, JMP Semantics:
• Computes value of comp and stores it in dest
• If the jump is true, it exectures the instruction stored in ROM[A] Examples:

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//Set RAM[300] to value of D register - 1
@300 //A = 300
M = D-1 //RAM[300] = D-1

// If (D-1==0) jump to execute the instruction stored in ROM[56]
@56 //A = 56
D-1;JEQ //if (D-1==0), goto 56

References: