https://devzone.nordicsemi.com/f/nordic-q-a/11132/debugging-with-ppiThe PPI has been configured to transmit a message every time the timer triggers ( every 1ms). I&#39;m using IAR Embedded Workbench 7.40.3.8938 as my IDE . When the system is in debug if i press the &#39;break&#39; button, the code appears to stop executionen-USTelligent Community 13Mon, 04 Jan 2016 16:34:36 GMThttps://devzone.nordicsemi.com/thread/41717?ContentTypeID=1Mon, 04 Jan 2016 16:34:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:abda439f-084d-4540-9ec5-85cc76a0c582RK<p>Yes it&#39;s expected that PPI would carry on when the processor is paused in debug. PPI is explicitly designed to work entirely separately from the processor, that&#39;s how it can route tasks and events even when the processor is sleeping. Think of it almost as a separate programmed system on the chip.</p> <p>No there&#39;s no simple way to pause the PPI via the debugger. I suppose if you had the ability to cause the debugger to write to some registers on halt, you could write the PPI disable register, but I can&#39;t think of an easy way to do that nor to turn it back on again afterwards.</p><div style="clear:both;"></div>