I am using ATMEGA64A controller for my project and i am trying to access the port A and port C for I/O action. If am am trying to set the output of the PORTA and PORTC to logic '1' the port is not accepting the whatever data i am sending to the port. The PORTA and PORTC are multiplexed with External Memory address bits.
I have not used any external pull ups fort the PORTA and PORTC.
Please suggest what resistors i have to access to make the PORTA and PORTC as I/O port.
I used DDRA and DDRC for defining it as the output port.
edit: moved to correct forum.