Maximum Negative voltage to gpio pin

I am using lpc2378 .I use zener diode for one application.It gives -0.8v pulse for some time. can it damage the gpio pins. What is maximum negaive voltage which we can apply to gpio pin.
Maximum Negative voltage to gpio pin

I am using lpc2378 .I use zener diode for one application.It gives -0.8v pulse for some time. can it damage the gpio pins. What is maximum negaive voltage which we can apply to gpio pin.
No Voltage at DAC0 pin of teensy 3.2?

I am trying to Write a digital value at DAC0 pin of teensy 3.2 MK20DX256H usisng Keil to get analog value But i get 240mV whereas i should get 3.3V according to the following formula ***Vout = Vin * ...
No Voltage at DAC0 pin of teensy 3.2?

I am trying to Write a digital value at DAC0 pin of teensy 3.2 MK20DX256H usisng Keil to get analog value But i get 240mV whereas i should get 3.3V according to the following formula ***Vout = Vin * ...
Reading battery voltage

Hello Guys, I am using NucleoF070RB board to read battery voltage using voltage sensor module. I read ADC can be started by three ways Poll Conversion, Interrupts, DMA. I found...