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LPC17xx UART2 & UART3 Setting

this is refer to discuss no 17250

I just want to share how to set the UART2 & UART3 register,
after reading further the datasheet, the UART2 & UART3 can
you enable with set the Power Connection Register.

/* power UP UART2 & UART3 */ LPC_SC->PCONP |= 0x03000000;

and then you can set-up the uart2 or uart3 register without hang.
and the port works correctly.

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