EM346-RTR datasheet(68/142 Pages) SILABS

68 / 142 page

EM346

Rev 1.0

8.2. Configuration

Before using a serial controller, configure and initialize it as follows:

1. Set up the parameters specific to the operating mode (slave for SPI, baud rate for UART, etc.).

2. Configure the GPIO pins used by the serial controller as shown in Tables 8.1.



"7.2. Configuration" on page 49 shows how to configure GPIO pins.

3. If using DMA, set up the DMA and buffers. This is described fully in "8.5. DMA Channels" on page 86.

4. If using interrupts, select edge- or level-triggered interrupts with the SCx_INTMODE register, enable the

desired second-level interrupt sources in the INT_SCxCFG register, and finally enable the top-level SCx

interrupt in the NVIC.

5. Write the serial interface operating mode (SPI or UART) to the SCx_MODE register.

Table 8.1. SC1 GPIO Usage and Configuration

PB1

PB2

PB3

PB4

SPI - Slave

SC1MISO

Alternate Output

(push-pull)

SC1MOSI

Input

SC1SCLK

Input

SC1nSSEL

Input

UART

TXD

Alternate Output

(push-pull)

RXD

Input

nCTS

Input1

nRTS

Alternate Output

(push-pull)*

*Note: used if RTS/CTS hardware flow control is enabled.

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