A few pins of atmega16 (D0,D1,D2) are always high when uC is powered.Does it mean those pins are damaged ??
Or is there a way to reset those pins to low ?

** I have tried programming the output of those pins

Thanks
jose

 

Request to moderator
Can you please move this thread to General electronics section ?

 

Simple way to tell, try another chip.

Or try connecting 4k7Ω (or anything from 1k to 10kΩ) from the pin to GND and see if the voltage is still high.

 

Which pins you have in mind?
D0 = PB0 ?? or what ?

 

@Jony130
PD0,PD1,PD2

 

Have you set DDRD to 1 and set PORD = 0
Or maybe by accident you enable USART?

 

i set port D to 0

No , I didnt enable USART

Also, pins C5,C6 show the same problem ...

 

Show as your program code.

 

void main(void)
{
DDRD=0x00;
DDRA=0xFF;
DDRB=0x00;
DDRC=0x00;
PINB=0x00;
PINC=0x00;
PIND=0x00;
PORTA=0x00;
<.......code.......>
}


I am using D as i/p port and A as o/p port...but as precaution I set B and C to 0 as well.....
Kindly point the error

 

Does the chip have a bootloader installed? If so, it might enable UART before main() starts. Explicitly disable subsystems you don't need. This also helps battery life if applicable. Also see the PRR register which is often overlooked.

 

I just burned the hex file...so I think bootloader is already installed

Explicitly disable subsystems you don't need. This also helps battery life if applicable. Also see the PRR register which is often overlooked.

Can you elaborate please...

And kindly explain cause of pins C5 and C6