Atmel SAM9X25, Manual

Page: 6 / 1145

6
11054A–ATARM–27-Jul-11
SAM9X25
Universal Synchronous Asynchronous Receiver Transmitter - USARTx
SCKx USARTx Serial Clock I/O
TXDx USARTx Transmit Data Output
RXDx USARTx Receive Data Input
RTSx USARTx Request To Send Output
CTSx USARTx Clear To Send Input
Universal Asynchronous Receiver Transmitter - UARTx
UTXDx UARTx Transmit Data Output
URXDx UARTx Receive Data Input
Synchronous Serial Controller - SSC
TD SSC Transmit Data Output
RD SSC Receive Data Input
TK SSC Transmit Clock I/O
RK SSC Receive Clock I/O
TF SSC Transmit Frame Sync I/O
RF SSC Receive Frame Sync I/O
Timer/Counter - TCx x=0..5
TCLKx TC Channel x External Clock Input Input
TIOAx TC Channel x I/O Line A I/O
TIOBx TC Channel x I/O Line B I/O
Serial Peripheral Interface - SPIx
SPIx_MISO Master In Slave Out I/O
SPIx_MOSI Master Out Slave In I/O
SPIx_SPCK SPI Serial Clock I/O
SPIx_NPCS0 SPI Peripheral Chip Select 0 I/O Low
SPIx_NPCS1-SPIx_NPCS3 SPI Peripheral Chip Select Output Low
Two-Wire Interface -TWIx
TWDx Two-wire Serial Data I/O
TWCKx Two-wire Serial Clock I/O
Table 3-1. Signal Description List (Continued)
Signal Name Function Type Active Level