RE: in system off mode , while(1) keep running ?

ToTo — Wed, 30 Mar 2016 11:12:43 GMT

Very clear guy, thanks ;)

RE: in system off mode , while(1) keep running ?

Susheel Nuguru — Wed, 30 Mar 2016 10:01:20 GMT

Hi ToTo,

In debug mode (while your debugger is controlling the chip) the System-OFF mode is emulated, which means that the chip really does not go to system off to keep the debugger link alive.

Please read about the emulated system off mode here

When in System OFF , all power regulators except for power reset and wakeup source are powered off. When the wakeup source is detected, it will wake the chip, reset the chip and enable all the power regulators.

Now this is what happens in emulated system off (debugger connected). The power regulators are not turned off, that is the reason you need while(1); because the CPU will still be running. But the wakeup source will just reset the chip (because it do not need to power on regulators as they were not turned off in emulated mode). This behaves exactly same like actual system off in debugger except that the the CPU is still running and power consumption is higher. This is very useful feature for debugging system off feature.

I hope that it made things clear.