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Reference Manual描述如下：All low-power modes are entered by setting the LPMCR register and executing the IDLE instruction.（所有的低功耗模式都是通过设置LPMCR寄存器并执行IDLE指令来进入的。），但是我现在的情况是电脑根本无法通过XDS110连接芯片，没有发送任何指令，为什么芯片会进入LPM
