MSB
enum { LSB, CSB, MSB };
#define MSB(y) ((y >> 8) & 0xff)
#define MSB(Y) (((Y) >> 8) & 0xff)
#define MSB(Y) (((Y) >> 8) & 0xFF)
#define MSB(__x) ((__x >> 8) & 0xff)
#define MSB(y) ((y >> 8) & 0xff)
#define MSB(x) ((uint8_t)((uint16_t)(x) >> 8))
#define MSB 1
#define MSB(x) ((uint8_t)((uint16_t)(x) >> 8))
#define MSB 0
#define MSB 3