During initialization, µC/OS-III creates between 0 and 4 3 internal tasks depending on configuration constants found in os_cfg.h:
OS_CFG_TASK_IDLE_EN enables OS_IdleTask()OS_CFG_STAT_TASK_EN enables OS_StatTask()OS_CFG_TASK_TICK_EN enables OS_TickTask()OS_CFG_TMR_EN enables OS_TmrTask()