User's Manual

Interface Pin Name Description

UART0:

TXD (U0TXD)

RXD (U0RXD)

Devices with UART interfaces can be connected with the module.

Downloading: U0TXD+U0RXD or GPIO2+U0RXD Communicating: UART0:

U0TXD, U0RXD, MTDO (U0RTS), MTCK (U0CTS) Debugging: UART1_TXD

(GPIO2) can be used to print debugging information.

UART IO15 (RTS)

IO13 (CTS)

UART1:

IO2(TXD)

By default, UART0 will output some printed information when the device is

powered on and is booting up. If this issue exerts influence on some specific

applications, users can exchange the inner pins of UART when initializing, that

is to say, exchange U0TXD, U0RXD with U0RTS, U0CTS.

I2S

I2S Input:

IO12

(I2SI_DATA) ;

IO13

(I2SI_BCK );

IO14

(I2SI_WS);

I2S Output:

IO15

(I2SO_BCK );

IO3

(I2SO_DATA);

IO2

(I2SO_WS ).

I2S interface is mainly used for collecting, processing, and transmission of

audio data.