I write this simple code to check my new burner :


void main(void)
DDRC = 0xFF;  //high pins



I use Extreme burner software to burn . My burner seems to work fine. It burn the code (said by the burner software ) but output is not as I expected. I burn two ATmega32 . For first one , PC2 , PC3, PC4 give high output (around 4.3 volt) and rest is low (around 1.7 volt) . For second one , PC0 , PC1 , PC7 pin high output and rest is low. I can't understand why ??? anyone can explain and give me a solution ?? Thanks enter image description here

  • \$\begingroup\$ How are the fuses programmed on the devices? \$\endgroup\$ Commented Dec 16, 2014 at 4:44
  • \$\begingroup\$ What is connected to the micro controller? just power and ground or any other devices? \$\endgroup\$
    – Gorloth
    Commented Dec 16, 2014 at 5:18
  • \$\begingroup\$ fuse is default. both MCU is new. I just unpack it and burn the code.@ Ignacio \$\endgroup\$
    – Anklon
    Commented Dec 16, 2014 at 10:37
  • \$\begingroup\$ Just power, ground and LED with small resistor at PORTC \$\endgroup\$
    – Anklon
    Commented Dec 16, 2014 at 10:38
  • 1
    \$\begingroup\$ Can you add a photo of the circuit (or a link) and a circuit showing exactly the pins that are connected? \$\endgroup\$
    – Spoon
    Commented Dec 16, 2014 at 13:04

1 Answer 1


ATmega32 fuse bits are enabled JTAG interface on PC2...PC5 by default. If you want to use PC2...PC5 in your project, you should disable JTAG by unprogrammed JTAGEN fuse bit.


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