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Exécution d'un code machine.md

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+up:: [[architecture des ordinateurs]]
+#informatique 
+
+---
+
+# Fetch Execute cycle
+
+## Fetch
+ 1. The [[program counter|PC]] is copied to the Register A (appears on the address bus)
+ 2. simultaneously :
+     - The [[program counter|PC]] is incremented by 1
+     - The instruction located at the given address (in the MAR) is stored into the MBR (via the data bus)
+ 3. contents of the MBR (the instruction to execute) is copied to the CIR (so the MBR is free for execution)
+## Decode
+ 4. The instruction in the CIR is decoded by the Control Unit (separated into opcode and operand.s)
+## Execute
+ 5. The instruction is executed
+
+# Instructions (Execute part)
+
+## Load value to register (LDR)
+> Example : `LDR R0, 10`
+
+The Memory location specified by the operand (`10`) is copied into the MAR (appears on the address bus)
+The value at the specified address (value at `10`) is loaded into the MBR, via the data bus.
+The value held in the MBR is copied into the specified register (`R0`)
+
+