Cannot access memory after clock config

[anto]

I have configured the card MCB1700 (LPC1768) with the following parameters of clock:
1) RTC oscillator
2) MSEL: 0x2254 (8788)
3) NSEL:0x0001 (1)
4) the PLL1 disabled
the objective is to operate the clock cpu to 12Mhz via an external quartz of 32KHz.
Unfortunately after this configuration are no longer able to reprogram the micro.
Cannot access memory (@ 0x00000000, Write, Acc Size: 4 bytes)
This is the message that appears every time I try to riprogrammaare micro.

Can you suggest a way to unlock the micro and it can be reprogrammed.

Thanks

[Omar_Anguiano]

Hello Antonello Stella

I suggest you to try programing your micro through ISP, please refer to chapter 32 of the LPC176x/5x User Manual: https://www.nxp.com/docs/en/user-guide/UM10360.pdf

Let me know if this is helpful, if you have more specific questions do not hesitate to ask me.

Best regards,

Omar