#pragma GCC optimize "-Og"
#include "ArduinoTrace.h"

//volatile unsigned int a;  //lo mismo
volatile uint16_t a=45000,b=15000,c; //lo mismo //max 65535

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
 
asm volatile(
  "lds r18,a \n" //bit menos significativo de a
  "lds r19,a+1 \n" //bit mas significativo de a
  "lds r20,b \n" //bit menos significativo de b
  "lds r21,b+1 \n" //bit mas significativo de b
  "add r18,r20 \n" // suma los bytes menos significatiovs de a y b  y lo guarda en r18
  "adc r19,r21 \n" // suma con carry, bytes mas significativos
  "sts c+1,r19 \n" //guarda el mas significativo
  "sts c,r18 \n" //guarda el menos significativo 
  :::"r18","r19","r20","r21"
);
DUMP(c);
}
void loop() {
  // put your main code here, to run repeatedly:

}