CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;