https://devzone.nordicsemi.com/f/nordic-q-a/11048/a-terrible-magical-conflict-problemHi: I&#39;ve developed nrf51822 about 1 year.I find a very terrible magical conflict problem.Please verify. Thank you. Platform: nrf51822QFAA H0 + SDK9 + KEIL5 1\ I want to use gpio(pin1) and uart(pin0 and pin2),and pin1 generate a pulse by nrf_delay_usen-USTelligent Community 13Mon, 28 Dec 2015 06:16:14 GMThttps://devzone.nordicsemi.com/thread/41286?ContentTypeID=1Mon, 28 Dec 2015 06:16:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:610f995e-9c30-4131-b11b-841905163acechenyu<p>I know what you mean, But the pulse wave I want is a kind of unique pulse ,not PWM.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/41285?ContentTypeID=1Mon, 28 Dec 2015 05:43:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1929e143-6515-496d-8a51-5f8f8b107a28xtting<p>why not you use the PWM module to do this.</p> <p>As I know the timer is not a hard ware timer, it use RTC to mock up a serial timer, which mean it need CPU resoure underlying. If you add any other code using CPU too, the timer is not accurat at all, or not accurate enough for PWM.</p><div style="clear:both;"></div>