_UTSR0
#define Ser1UTSR0 _UTSR0 (1) /* Ser. port 1 UART Status Reg. 0 */
#define Ser2UTSR0 _UTSR0 (2) /* Ser. port 2 UART Status Reg. 0 */
#define Ser3UTSR0 _UTSR0 (3) /* Ser. port 3 UART Status Reg. 0 */