strange issue with atmega328P

Using Arduino Microcontrollers
#1

i am programming this new atmega328P via AVR MKII and atmel studio , i successfully burnt the boot loader n then when i upload the blink program (with 1sec delay) it works fine on the arduino uno board but when i put it on the breadboard it does blink but extremely slow with a delay of min or so.
if i replace the chip with the one that came with arduino it works fine on the breadboard .
I am setting the fuses according to this video as extended: 0xO5 , high: 0xDE , low: 0xFF
if i set it to the fuse that the original arduino chip has then it doesnt blink at all .

i have a feeling its a fuse issue , on my bread board i have a 13.5Mhz crystal .
please note that the original chip works fine on the bread board so it cant be a hardware issue.

thanks

#2

Use the Arduino IDE to write the bootloader, it also sets the fuses.
Or have a look into the file boards.txt to see the fuses settings for the Arduino.
Get a 16MHz crystal, or build a new bootloader for for 13.5MHz.

#3

aliyesami:
I am setting the fuses according to this video as extended: 0xO5 , high: 0xDE , low: 0xFF

Efuse should be 0x05, not 0xO5 (It's a zero, not an "O").

Don't know if it was a typo, or if it fixes anything but just wanted to throw it out there...

#4

External crystal and breadboard always gives me trouble because of the stary capacitance.
Set the fuses to internal 8mhz oscilator and try the led blink sketch on breadboard without crystal.

#5