Using UTXD3 pin on SAMS70J21

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I was hoping to create another serial output stream using the UTXD3 pin on a SAMS70J21. The data sheet claims it is connected to Pin 2 on the 64 pin package.  When I try to use UART3 to transmit serial data from this pin I get no response from the device.

The data sheet also claims that UTXD4 is connected to Pin 55.

It appears that UART 3 and 4  are disabled in the chip. If so, why are these TX pins listed as being connected to the respective UARTs.


Anyone have additional insight to this?




erik piip
tartu EE.