1. 进程管理( Task Management )
1) 进程类型( Classes of Tasks )
n Contain especially short responses and interrupt disable times.
n Contain a separate register bank and a separate stack area (register banks 1, 2 and 3).(Figure 1)
n Contain the highest task priority (priority 3) and can therefore interrupt standard tasks.
n All contain the same priority and can therefore not be mutually interrupted.
n Can be interrupted by c51 interrupt functions.
n A maximum of three fast tasks can be active in the system.
n Require somewhat more time for the task switching compared to fast tasks.
n Share a common register bank and a common stack area (register bank 0).
n The current contents of registers and stack are stored in the external (XDATA) memory during a task change.
n Can be interrupted by fast tasks.
n Can interrupt themselves mutually.
n Can be interrupt by c51 interrupt functions.