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     I use the DTR and RTS control  Reset and ISP  Enable PIN (Reset PIN number 17, ISP Enable PIN number 53,(P2.10)

   I use this circuit in LPC210x and LPC213x and LPC22xx system, it can ISP the MCU.

  I had change the R15 from 1K to 10K.

  I had check the power 3.3V is right, and the circuit no problem.

  I do't know why it can't ISP.

  Thank you