Sketch running at half speed after importing to Atmel Studio

Using Arduino Avrdude, stk500, Bootloader issues
1

Hello!

After importing my arduino sketch to atmel studio 7, and flashing it to a Atmega328P with a 16mhz external resonator connected. I am finding that the program is running at 1/2 speed.

I have verified that F_CPU is set to 16,000,000. My fuses are set to what I can best determine works for the for the 16mhz resonator (Using same ones from arduino nano. Literally hot aired the resonator off of a nano and soldered it on to my PCB). Fuses are as follows.

Ex: FD
High: DA
Low : FF

CKSEL is set to "Ext. Crystal Osc. 8.0- MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65ms"

OScope reads 16MHz off of the resonator

Any help would be greatly appreciated!!

2

Just to rule out anything in your sketch, you get the same effect with the famous blink sketch (0.5Hz) ?

3

I have no LED's in my circut. I am not using an arduino board, just loading an arduino sketch onto a Atmel328P via ISCP header on a custom PCB

4

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