PIC12LF1822使用MPLABIDEV8.88连接ICD2不能下载程序，首先ICD2是好的，我能下载PIC1825K80.硬件电路的连接也没有问题，最小系统，VPP有上啦10K电阻到VDD。但是ICD2总是自检不成功，读不到芯片的ID。请懂的朋友赐教
MPLAB ICD 2 ready for next operation
Connecting to MPLAB ICD 2
...Connected
Setting Vdd source to target
ICDWarn0020: Invalid target device id (expected=0x140, read=0x0)
...Reading ICD Product ID
Running ICD Self Test
... Failed Self Test. See ICD2 Settings (Programmer->Settings) (status tab) for details.
MPLAB ICD 2 ready for next operation
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