3.10. UARTs

Pin	Signal	Description	type	I/O
59, 63, 67	UART1_TXD UART2_TXD UART3_TXD	Transmit Data output signal	VDDIO	O
60. 64. 68	UART1_RXD UART2_RXD UART3_RXD	Receive Data input signal	VDDIO	I
61, 65, 69	UART1_RTS UART2_RTS UART3_RTS	Request to Send input signal	VDDIO	I
62, 66, 70	UART1_CTS UART2_CTS UART3_CTS	Clear to Send output signal	VDDIO	O

3.10.1. UART Example diagram