参考
プログラム
//highByte_lowByte_UNO3_1
#include <Arduino.h>
void setup() {
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
int a = 0x8765;
unsigned char c[2];
c[0] = highByte(a);
c[1] = lowByte(a);
Serial.print(c[0],HEX);
Serial.print(',');
Serial.println(c[1],HEX);
delay(1000);
}