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Serial interfaces<br />
<strong>STM32W108C8</strong><br />
Figure 8.<br />
Serial controller block diagram<br />
SCx Interrupt<br />
0<br />
OFF<br />
INT_SCxCFG<br />
INT_SCxFLAG<br />
SC1_UARTPER/FRAC<br />
Baud Generator<br />
SC1<br />
only<br />
1<br />
UART<br />
SC1_UARTSTAT<br />
SC1_UARTCFG<br />
UART<br />
Controller<br />
TXD<br />
RXD<br />
nRTS<br />
nCTS<br />
SCx_MODE<br />
2<br />
SPI<br />
SCx_SPISTAT<br />
SCx_SPICFG<br />
SPI Slave<br />
Controller<br />
SPI Master<br />
Controller<br />
MISO<br />
MOSI<br />
SCLK<br />
nSSEL<br />
SCx_RATELIN/EXP<br />
Clock Generator<br />
3<br />
SCx_DATA<br />
I 2 C<br />
SCx_I2CSTAT<br />
SCx_I2CCTRL1<br />
SCx_I2CCTRL2<br />
I 2 C Master<br />
Controller<br />
SCL<br />
SDA<br />
TX-FIFO<br />
SCx TX DMA<br />
channel<br />
SCx RX DMA<br />
channel<br />
SCx_DMACTRL<br />
DMA<br />
Controller<br />
SCx_DMASTAT<br />
SCx_RXCNTA/B SCx_TXCNT<br />
SCx_RXCNTSAVED<br />
SCx_TX/RXBEGA/B<br />
SCx_TX/RXENDA/B<br />
SCx_RXERRA/B<br />
RX-FIFO<br />
9.2 Configuration<br />
Before using a serial controller, it should be configured and initialized as follows:<br />
1. Set up the parameters specific to the operating mode (master/slave for SPI, baud rate<br />
for UART, etc.).<br />
2. Configure the GPIO pins used by the serial controller as shown in Table 39 and<br />
Table 40. Section 8.1.2: Configuration on page 56 shows how to configure GPIO<br />
pins."If using DMA, set up the DMA and buffers. This is described fully in Section 9.13:<br />
DMA channel registers on page 100.<br />
3. If using interrupts, select edge- or level-triggered interrupts with the SCx_INTMODE<br />
register, enable the desired second-level interrupt sources in the INT_SCxCFG<br />
register, and finally enable the top-level SCx interrupt in the NVIC.<br />
4. Write the serial interface operating mode - SPI, I 2 C, or UART - to the SCx_MODE<br />
register.<br />
73/215 Doc ID 018587 Rev 2
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