EM341-RTR datasheet(67/237 Pages) SILABS

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EM341

Rev 1.0

8. Serial Controllers

8.1. Overview

The EM341 has two serial controllers, SC1 and SC2, which provide several options for full-duplex synchronous

and asynchronous serial communications.



SPI (Serial Peripheral Interface), master or slave



TWI (Two Wire serial Interface), master only



UART (Universal Asynchronous Receiver/Transmitter), SC1 only



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.

Note: The notation SCx means that either SC1 or SC2 may be substituted to form the name of a specific register or field within

a register.

Figure 8.1. Serial Controller Block Diagram

SC1 _U AR TST AT

SC x_SPISTAT

SC x_SPIC FG

SC x_ TW ISTAT

SC x_TW ICTR L1

SC x_TW ICTR L2

SC x _R ATELIN /EXP

SC 1 _U ARTPER / FR AC

Baud Generator

Clock Generator

UART

C ontroller

TW I M aster

C ontroller

SCx_D ATA

SPI M aster

C ontroller

UART

SPI

TW I

OFF

SC x_ M OD E

nR TS

nC TS

SC LK

MOSI

MISO

SDA

TXD

RXD

RX-FIFO

TX-FIFO

SC x _TX/R XBEGA /B

SC x_ R XC N TA/B

SC x_TXC NT

SCx_ D M ASTAT

SCx_D M AC TR L

SCx_R XER RA /B

DM A

C ontroller

SCL

IN T_SC xFLAG

IN T_SCxC FG

SC 1 _U ART CFG

SC x Interrupt

SC x TX D M A

channel

SCx RX DM A

channel

SC x _TX/R XEN D A /B

SPI Slave

C ontroller

nSSEL

SC x_R XC N TSAVED

SC 1

only

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