BenchChapter 5: Half duplex

B34SOFT START

The task

A soft start brings a supply up gently instead of all at once.

On each tick of P1, raise the duty on P0 by 10 percent, from 0 up to 80.

Then hold it at 80 for good.

The chip's ports, each with its kind and the parts its signal reaches. Cyan reads, lemon writes.

B can keep the duty between ticks: MOV B, A stores it and MOV A, B brings it back.

Each hint goes a step further than the one before. Open them one at a time.

Hint 1Show

Compare the duty with 80 before you raise it. Once it is there, skip the rest.

Hint 2Show

After SUB 80 and the test, ADD 90 gives the old duty plus 10.

Reveal the Full SolutionThe complete program for SOFT START. Open it only when you want the answer.

The game's own solution. It passes every test and scores exactly par on every benchmark.

Climb 10 percent a tick to 80, then hold.

u1SC-2 standard

L: IN P1
MOV A, B
SUB 80
JZ L
ADD 90
MOV B, A
OUT P0