Table 1 Sequence for realizing an arithmetic subtraction (SUB)
SUB A,#n | CP | LD_I | LD_A | LD_ACC | LD_MEM | E_A | E_MEM | E_ACC | SUB | ADD | Instruction |
|---|---|---|---|---|---|---|---|---|---|---|---|
T0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | IR ← MEM |
T1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | PC ← PC + 1 |
T2 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | A ← MEM |
T3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | PC ← PC + 1 |
T4 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | ACC ← A-ACC |