EM342-RTR datasheet(68/143 Pages) SILABS

68 / 143 page

EM342

Rev 1.0

8. Serial Controllers

8.1. Overview

The EM342 has one serial controller, SC1, which provides several options for full-duplex synchronous and

asynchronous serial communications.



SPI (Serial Peripheral Interface), slave only



UART (Universal Asynchronous Receiver/Transmitter)



Receive and transmit FIFOs and DMA channels, SPI and UART modes

Receive and transmit FIFOs allow faster data speeds using byte-at-a-time interrupts. For the highest SPI and

UART speeds, dedicated receive and transmit DMA channels reduce CPU loading and extend the allowable time

to service a serial controller interrupt. Polled operation is also possible using direct access to the serial data

registers. Figure 8.1 shows the components of the serial controllers.

Figure 8.1. Serial Controller Block Diagram

SC 1 _ UARTSTAT

SC1 _ SPISTAT

SC1 _ SPICFG

SC1 _ RATELIN / EXP

SC 1 _ UARTPER / FRAC

Baud Generator

Clock Generator

UART

Controller

SC1 _ DATA

UAR T

SPI

OFF

SC1 _ MODE

nRTS

nCTS

SCLK

MOSI

MISO

TXD

RXD

RX - FIFO

TX- FIFO

SC1 _TX / RXBEGA /B

SC1 _ RXCNTA /B

SC1 _ TXCNT

SC1 _ DMASTAT

SC1 _ DMACTRL

SC1 _ RXERRA /B

DMA

Controller

INT _ SC1FLAG

INT _ SC1CFG

SC 1 _ UARTCFG

SC1 Interrupt

SC1 TX DMA

channel

SC1 RX DMA

channel

SC1 _TX / RXENDA /B

SPI Slave

Controller

nSSEL

SC1 _ RXCNTSAVED

SC 1

only

EM342-RTR Datenblatt(PDF) 68 Page - Silicon Laboratories

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