I would like to drive STM32L011D3 GPIO in output to "1" or "0" with a minimum of instruction. I think we need:1 LDR + 1 ORR or AND + 1 STR = 3 instructions and 5 cycles Is there a more cycle-efficient way to do this?

[LaurentLef]

Is it possible to set an output to "1" or "0" with an instruction of one cycle?

[Tesla DeLorean]

Do a singular write to the BSRR register rather than RMW the ODR one.​

[waclawek.jan]

Use hardware (e.g. timers) wherever possible.

Relationship between instructions and machine cycles is far from being straighforward.

JW