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EM342-RTR Datasheet(PDF) 69 Page - Silicon Laboratories

Part # EM342-RTR
Description  High-Performance, Integrated RF4CE System-on-Chip
PDF  143 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

EM342-RTR Datasheet(HTML) 69 Page - Silicon Laboratories

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EM342
Rev 1.0
69
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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