#define	    sda     P0_0                     // Serial data pin
#define	    scl     P0_1                     // Serial clock pin

#define	    set_sda     (P0_0=0x01)          // Set Serial data pin
#define	    set_scl     (P0_1=0x01)          // Set Serial clock pin

#define	    clr_sda     (P0_0=0x00)          // Clear Serial data pin
#define	    clr_scl     (P0_1=0x00)          // Clear Serial clock pin