PSTWO_BIT
#define CTRL_RESET PSTWO_BIT(7) /* Component reset when set */
#define STAT_TX_BUSY PSTWO_BIT(6) /* Transmitting byte */
#define STAT_RX_DONE PSTWO_BIT(7) /* Received a byte */
#define INTR_RX_FULL PSTWO_BIT(2) /* Received byte */
#define INTR_RX_ERR PSTWO_BIT(3) /* Received corrupt packet */
#define INTR_RX_OVER PSTWO_BIT(4) /* RX overrun */
#define INTR_TX_DONE PSTWO_BIT(5) /* TX packet acknowledged */
#define INTR_TX_SENT PSTWO_BIT(6) /* TX packet sent */
#define INTR_TX_TIMO PSTWO_BIT(7) /* Clock lost while TX */