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EM357-RTR Datasheet(PDF) 72 Page - List of Unclassifed Manufacturers

Part # EM357-RTR
Description  High-Performance, Integrated ZigBee/802.15.4 System-on-Chip
PDF  240 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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EM357-RTR Datasheet(HTML) 72 Page - List of Unclassifed Manufacturers

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EM351 / EM357
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
0
1
2
3
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
8-1
120-035X-000D
Preliminary



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