描述
这两条指令的功能是将进位标志继电器25504置位（即置ON）或强制将进位标志继电器25504复位（即置OFF）。当这两条指令前面状态为ON时，执行指令，否则不执行。通常在执行加、减运算操作之前，先执行CLC指令来清进位位，以确保运算结果的正确。
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