atmega 16 PORTD problem

[D.V.G. Krishna]

while using atmega16 mc

i got a problem with port D

i tried to use it as an input port

but it is not working as in put

is it a bidirectional or not????????????

 

same problem occured incase of atmega 8

[micky]

Hi Krishna,

Yes, The ATmega 16 & ATmega 8 PORTD pins are bidirectional pins.

Can u explain ur problem briefly?

1. Which programmer are u using?

2. Are u using any peripherals like TWI…

 

[D.V.G. Krishna]

im using usb programmer from robotech labs

 

im not using uart or twi

 

 

 

[dagakshay]

Paste you code here…. Visit this link it might help you out

 

 

http://www.engineersgarage.com/embedded/avr-microcontroller-projects/setting-input-pin-circuit

 

 

[D.V.G. Krishna]

i want ti interface an IR sensor to atmega16

the sensor is active high

if i write

DDRD=0x00;

PORTD=0xff;

 

the pins will be by default high

when sensor detects object it gives high

the mc cannot detact a change in input

 

can i write PORTD=0x00;

what will happen?????????

[dagakshay]

Can you paste your code here…

 

i would like to see the code once… the link i had dive you above shows how to take input… and yes you are correct about the internal pull up goes high and it must detect the active low input signal.

[Author]

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