;;2、进水定时
InWater_Time:      
        BRCLR  F_Time_Start,FLAG_1,PressBack_Time  ;从进水开始至压力开关闭合定时       
        LDHX   Time_Buffer                         ;为主程序提供进水测时用
        AIX    #$01
        STHX   Time_Buffer
        BRA    Drain_Fun

PressBack_Time:                  
        BRCLR  F_Infall_Time,FLAG,Drain_Fun        ;压力开关闭合后开始定时           
       
        LDHX   Infall_Time       
        AIX    #-$01
        STHX   Infall_Time
       BNE    Drain_Fun
        BCLR   F_Infall_Time,FLAG                 ;清零进水定时开始标志
        BSET   F_Stop_Infall,FLAG                 ;设置进水停标志                 

;---------------------------------------
;;3、排水           
Drain_Fun:       

                                                                  
;---------------------------------------
;;4、程控器扫描
Scan:                    
        JSR PoRTSet_Pro ;call port direction set subroutine

Scan_Switch:       
        BRSET F_Switch_Flag,FLAG,Scan_Key                         
            …………………………………
                ……………………………………

各位大侠以上红色那段代码表示的是什么意思！