SYSASIC_EVENT_INTR_BIT
SYSASIC_EVENT_INTR_BIT(event)) != 0)
SYSASIC_EVENT_INTR_BIT(event);
SYSASIC_EVENT_INTR_BIT(event)) == 0)
~SYSASIC_EVENT_INTR_BIT(event);
SYSASIC_EVENT_INTR_BIT(event)) == 0)
evbit = SYSASIC_EVENT_INTR_BIT(event);