本人用三菱模拟软件在练习一个广告灯的程序时:启动时,要求8个广告灯从右到左隔一秒都点亮,全部点亮时,再从左到右隔一秒熄灭,全部灯熄灭后,再从左到右隔一秒每个点亮,全部灯亮时,再从右到左隔一秒熄灭,并周而复始上述过程
               ldi t0
                            out t0 k10
                            ldi t1 
                            out t1 k80
                           out incp k1m0
                          ldi m1 
                          and t0
                          out sftlp m0 y0 k8 k1
                          ld m1
                        and t0
                          out sftrp m0 y0 k8 k1
               为什么一开始,灯只能亮到Y6,不能亮到Y7
             哪位大侠解释一下,谢谢!!!