EM357-RTR datasheet(70/241 Pages) SILABS

70 / 241 page

Rev 1.3

8. Serial Controllers

8.1. Overview

The EM35x 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_UARTSTAT

SCx_SPISTAT

SCx_SPICFG

SCx_TWISTAT

SCx_TWICTRL1

SCx_TWICTRL2

SCx _RATELIN /EXP

SC1_UARTPER/FRAC

Baud Generator

Clock Generator

UART

Controller

TWI Master

Controller

SCx_DATA

SPI Master

Controller

UART

SPI

TWI

OFF

SCx_MODE

nRTS

nCTS

SCLK

MOSI

MISO

SDA

TXD

RXD

RX-FIFO

TX-FIFO

SCx _TX/RXBEGA /B

SCx_RXCNTA/B

SCx_TXCNT

SCx_DMASTAT

SCx_DMACTRL

SCx_RXERRA/B

DMA

Controller

SCL

INT_SCxFLAG

INT_SCxCFG

SC1_UARTCFG

SCx Interrupt

SCx TX DMA

channel

SCx RX DMA

channel

SCx _TX/RXENDA/B

SPI Slave

Controller

nSSEL

SCx_RXCNTSAVED

SC1

only

EM357-RTR 数据表(PDF) 70 Page - Silicon Laboratories

EM357-RTR 数据表(HTML) 70 Page - Silicon Laboratories

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

EM357-RTR 数据表(PDF) 70 Page - Silicon Laboratories

EM357-RTR 数据表(HTML) 70 Page - Silicon Laboratories

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载