
5
11090BS–ATARM–22-Oct-13
SAM3S8/SD8 Summary
3.
Signal Description
Table 3-1 gives details on signal names classified by peripheral.
Table 3-1.
Signal Description List
Signal Name
Function
Type
Active
Level
Voltage
reference
Comments
Power Supplies
VDDIO
Peripherals I/O Lines and USB transceiver
Power Supply
Power
1.62V to 3.6V
VDDIN
Voltage Regulator Input, ADC, DAC and
Analog Comparator Power Supply
Power
1.8V to 3.6V(4)
VDDOUT
Voltage Regulator Output
Power
1.8V Output
VDDPLL
Oscillator and PLL Power Supply
Power
1.62 V to 1.95V
VDDCORE
Power the core, the embedded memories
and the peripherals
Power
1.62V to 1.95V
GND
Ground
Clocks, Oscillators and PLLs
XIN
Main Oscillator Input
Input
VDDIO
Reset State:
- PIO Input
- Internal Pull-up disabled
- Schmitt Trigger enabled(1)
XOUT
Main Oscillator Output
Output
XIN32
Slow Clock Oscillator Input
Input
XOUT32
Slow Clock Oscillator Output
Output
PCK0 - PCK2
Programmable Clock Output
Output
Reset State:
- PIO Input
- Internal Pull-up enabled
- Schmitt Trigger enabled(1)
Real Time Clock
RTCOUT0
Programmable RTC waveform output
Output
VDDIO
Reset State:
- PIO Input
- Internal Pull-up disabled
- Schmitt Trigger enabled(1)
RTCOUT1
Programmable RTC waveform output
Output
Serial Wire/JTAG Debug Port - SWJ-DP
TCK/SWCLK
Test Clock/Serial Wire Clock
Input
VDDIO
Reset State:
- SWJ-DP Mode
- Internal pull-up disabled
(5)- Schmitt Trigger enabled(1)
TDI
Test Data In
Input
TDO/TRACESWO
Test Data Out / Trace Asynchronous Data
Out
Output
TMS/SWDIO
Test Mode Select /Serial Wire Input/Output
Input / I/O
JTAGSEL
JTAG Selection
Input
High
Permanent Internal
pull-down