7
11090BS–ATARM–22-Oct-13
SAM3S8/SD8 Summary
Universal Synchronous Asynchronous Receiver Transmitter USARTx
SCKx USARTx Serial Clock I/O
TXDx USARTx Transmit Data I/O
RXDx USARTx Receive Data Input
RTSx USARTx Request To Send Output
CTSx USARTx Clear To Send Input
DTR1 USART1 Data Terminal Ready I/O
DSR1 USART1 Data Set Ready Input
DCD1 USART1 Data Carrier Detect Output
RI1 USART1 Ring Indicator 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 - TC
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
Pulse Width Modulation Controller- PWMC
PWMHx PWM Waveform Output High for channel x Output
PWMLx PWM Waveform Output Low for channel x Output
only output in
complementary mode
when dead time insertion
is enabled.
PWMFI0 PWM Fault Input Input
Serial Peripheral Interface - SPI
MISO Master In Slave Out I/O
MOSI Master Out Slave In I/O
SPCK SPI Serial Clock I/O
SPI_NPCS0 SPI Peripheral Chip Select 0 I/O Low
SPI_NPCS1 -
SPI_NPCS3
SPI Peripheral Chip Select Output Low
Table 3-1. Signal Description List (Continued)
Signal Name Function Type
Active
Level
Voltage
reference Comments
