#include "avr/io.h"

uint8_t appdata_0 __attribute__((address (0x8F00)));
uint8_t appdata_1 __attribute__((address (0x8F01)));
uint8_t appdata_2 __attribute__((address (0x8F02)));
uint8_t testvar;

int main (void)
{
 testvar = 0x45;
 appdata_0 = 0xAB;
 appdata_1 = 0xCD;
 appdata_2 = testvar;
 CPU_CCP = CCP_SPM_gc;
 NVMCTRL.CTRLA = 0x03; // ERWP Erase and write page (NVMCTRL.ADDR selects which memory)
 
 USERROW.USERROW1 = 0x11;
 USERROW.USERROW2 = 0x22;
 USERROW.USERROW3 = testvar;
 CPU_CCP = CCP_SPM_gc;
 NVMCTRL.CTRLA = 0x03; // ERWP Erase and write page (NVMCTRL.ADDR selects which memory)

 while(1)
    {
    }
}