SK_IM_USECS
sk_win_write_4(sc, SK_Y2_LEV_ITIMERINIT, SK_IM_USECS(100));
sk_win_write_4(sc, SK_Y2_TX_ITIMERINIT, SK_IM_USECS(1000));
sk_win_write_4(sc, SK_Y2_ISR_ITIMERINIT, SK_IM_USECS(20));
sk_win_write_4(sc, SK_Y2_ISR_ITIMERINIT, SK_IM_USECS(4));
sk_win_write_4(sc, SK_IMTIMERINIT, SK_IM_USECS(100));