signal-edge-detector

              | MOV ACC, RIGHT  | MOV LEFT, DOWN |
              | MOV UP, ACC     |                |
              | MOV ACC, DOWN   |                |
______________|_________________|________________|__________
              | MOV UP, RIGHT   | MOV UP, ACC    |
              |                 | SUB LEFT       |
              |                 | JLZ P          |
              |                 | JMP D          |
              |                 | P: NEG         |
              |                 | D: SUB 10      |
              |                 | JLZ W          |
              |                 | MOV 1, DOWN    |
              |                 | JMP END        |
              |                 | W: MOV 0, DOWN |
              |                 | END: NOP       |
______________|_________________|________________|__________
COMMUNICATION |                 |MOV UP, DOWN    |
FAILURE       |                 |                |
______________|_________________|________________|__________