EM357-RTR datasheet(93/241 Pages) SILABS

93 / 241 page

Rev 1.3

8.6. UART—Universal Asynchronous Receiver/Transmitter

The SC1 UART is enabled by writing 1 to SC1_MODE. The SC2 serial controller does not include UART functions.

The UART supports the following features:



Flexible baud rate clock (300 bps to 921.6 kbps)



Data bits (7 or 8)



Parity bits (none, odd, or even)



Stop bits (1 or 2)



False start bit and noise filtering



Receive and transmit FIFOs



Optional RTS/CTS flow control



Receive and transmit DMA channels

8.6.1. GPIO Usage

The UART uses two signals to transmit and receive serial data:



TXD (Transmitted Data) - serial data sent by the EM35x



RXD (Received Data) - serial data received by the EM35x

If RTS/CTS flow control is enabled, these two signals are also used:



nRTS (Request To Send) - indicates the EM35x is able to receive data



nCTS (Clear To Send) - inhibits sending data from the EM35x if not asserted

The GPIO pins assigned to these signals are shown in Table 8.10.

Table 8.10. UART GPIO Usage

TXD

RXD

nCTS1

nRTS*

Direction

Output

Input

Output

GPIO Configuration

Alternate

Output (push-pull)

Input

Alternate

Output (push-pull)

SC1 pin

PB1

PB2

PB3

PB4

*Note:

Only used if RTS/CTS hardware flow control is enabled.

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