8051 MCU is bits MCU. It has timers in it, and each timer is bits timer.

The two timers of mcs-1 have two working modes, namely, timing and counting

When a repeating timer expires,（）. A: The When-Timer-Expired trigger resets the timer's iteration parameter.  B: The When-Custom-Item-Event trigger fires and executes the desired actions.  C: It is put in a queue of expired timers for processing on a first-in-first-out basis.  D: The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.

When a repeating timer expires,（）. A: The When-Timer-Expired trigger resets the timer's iteration parameter. B: The When-Custom-Item-Event trigger fires and executes the desired actions. C: It is put in a queue of expired timers for processing on a first-in-first-out basis. D: The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.&e

在PANELVIEW显示面板上对记时器和报警设定值进行修改步骤是（） 1.这时会显示所有可以修改的参数，用上下箭头选择需要修改的参数，按ENTER进入修改屏幕① 2.按F2至MAinSCReen；② 3.按F5至TIMERS&SETPOINTS屏幕；③ 4.根据屏幕的提示按相应的功能键进入具体参数的修改画面，输入想要修改的值按ENTER A: ②③①④ B: ①②③④ C: ②①④③ D: ③①②④