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15. Instruction format. Binary operand. 0. 15. Memory. 4096 x 16. Instructions Basic Memory-Reference Instructions Examples of Control Timing Signals. Apr 2, 2020 - Memory Reference – These instructions refer to memory address as an operand. The other operand is always accumulator. Specifies 12-bit address, 3-bit opcode (other than 111) and 1-bit addressing mode for direct and indirect addressing. The rest 12 bits specify register operation. In Memory-reference instruction, 12 bits of memory is used to specify an address and one bit to specify the addressing mode 'I'. Register - reference instruction. Memory Reference Instructions. 2. Register Reference Instructions. 3. Input/Output In Memory reference instruction: First 12 bits(0-11) specify an address. Jul 26, 2018 -