用pic-icd2.5在线仿真或者烧录pic16f676时,一块实验板接上去直接就可以检测到676,而另一块总是检测不到,但可以正常工作。检测不到时提示信息如下:
mplab ide下programmer——select programmer——icd 2,提示出错: Connecting to MPLAB ICD 2 ...Connected Setting Vdd source to MPLAB ICD 2 ICDWarn0020: Invalid target device id (expected=0x87, read=0x1FF) ICDWarn0044: Target has an invalid calibration memory value (0x3FFF). Continue? ...Reading ICD Product ID Running ICD Self Test ...Passed MPLAB ICD 2 Ready 读的设备地址总是出错,有时还出现0x0。
请帮忙分析一下,原因可能是什么,谢谢!
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