Content originally posted in LPCWare by vladimirro on Sat Jun 20 13:07:18 MST 2015
Hello again
Let me introduce another problem I faced with LPC1114.
I tried to implement PWM and I noticed that the low state never reached 0V. It varied from 400mV to 600mV.
Then I set one of the GPIO to logic low and it turned out that my uC doesn't output 0V but 0,4-0,6V...
I couldn't find any information about voltage levels of GPIO in LPC1114 but I guess logic low should be 0V.
I probed the GND pin and it is 0V.
What can be a reason of such behaviour?