从动触发器正在进行置位和复位。
若俘获状态触发器处于置位状态时，程序停在即将执行而尚未执行的下一条指令上，该指令是从存储单元n中取出来的。
If the trapping mode flip-flop is set and the program includes any one of certain instructions, the instruction is not performed but the next instruction is taken from location n.
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