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Pickit3 Program Can Not Recognize Chip

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Pickit3 program can’t recognize chip
Hello,can anyone here help me out?
The tip is given below:
Code:
Target Device ID (0x0) is an Invalid Device ID. Please check your connections to the Target Device.
Situations:
It can be programmed after changing chip, and the circuit is no any problems.Here the original chip is also continue to work. But I don’t know why it can’t enter into programming ! The chip I used is PIC18F45K20.
This is the PIC18F45K20 datasheet: http://www.kynix.com/uploadfiles/pdf8798/PIC18F45K20-E2fMV.pdf Please look the details from it if needed.Can you help me solve it?
Thanks a lot!
asked Apr 25, 2017 in Device Manager by ling1995 New to the Community (0 points)

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2 Answers

0 votes
What Digi product are you working with?
answered Apr 27, 2017 by mvut Veteran of the Digi Community (12,001 points)
0 votes
I would check the connections between the PICKIT3 and the PIC. Normally the problem is a bad connection, reset line included. If the connections look good, it is also possible that something else on the programing lines is holding them HIGH or LOW, or there is to much capacitance.
answered Nov 3, 2017 by callwyat New to the Community (2 points)
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