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CLA赋值问题



我在单步调试28035的cla时,如下 :

MDEBUGSTOP

............

MMOVIZ  MR1,#0.0
 MMOVIZ  MR1,#1.0

MCMP32  MR3,MR2

........................

为何MR1的值以0.0与1.0之间循环更替呢?比如,第一次运行完事MR1=1.0,而第二次就为0.0,第三次又为1.0,以此循环.