Opcodes

Opcodes are instructions used to perform actions

Types of 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 conditions codes for flags n, z, p

• n: Negative
• z: Zero
• p: Positive

Data Types

Opcodes are 16 bit, 2's Complement(Can be negative) integer