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MSP430延时程序__delay_cycles问题



用IAR在单片调试时单步执行时,执行到__delay_cycles时就走不下去,跳过它就可以,程序下到单片机内测试__delay_cycles的时间还是很准的,不知道怎么回事,是不是__delay_cycles就不可以单步执行?