3. Signal Description
gives details on signal names classified by peripheral.
Table 3-1.
Signal Name
Signal Description List
Function
Type
Power Supplies
Active
Level
Voltage
reference
Comments
VDDIO
VDDIN
VDDOUT
VDDPLL
VDDCORE
GND
Peripherals I/O Lines and USB transceiver
Power Supply
Voltage Regulator Input, ADC, DAC and
Analog Comparator Power Supply
Voltage Regulator Output
Oscillator and PLL Power Supply
Power the core, the embedded memories
and the peripherals
Ground
Power
Power
Power
Power
Power
Ground
1.62V to 3.6V
1.62V to 3.6V
1.2V Output
1.08 V to 1.32V
1.08V to 1.32V
Clocks, Oscillators and PLLs
XIN
XOUT
XIN32
XOUT32
Main Oscillator Input
Main Oscillator Output
Slow Clock Oscillator Input
Slow Clock Oscillator Output
Input
Output
Input
Output
VDDIO
Reset State:
- PIO Input
- Internal Pull-up enabled
- Schmitt Trigger enabled
Reset State:
- PIO Input
- Internal Pull-up disabled
- Schmitt Trigger enabled
PCK0 - PCK2
Programmable Clock Output
Output
Real Time Clock
RTCOUT0
Programmable RTC waveform output
Output
VDDIO
RTCOUT1
Programmable RTC waveform output
Output
Reset State:
- PIO Input
- Internal Pull-up disabled
- Schmitt Trigger enabled
Serial Wire/JTAG Debug Port - SWJ-DP
TCK/SWCLK
TDI
TDO/TRACESWO
TMS/SWDIO
JTAGSEL
Test Clock/Serial Wire Clock
Test Data In
Test Data Out / Trace Asynchronous Data
Out
Test Mode Select /Serial Wire Input/Output
JTAG Selection
Input
Input
Output
Input / I/O
Input
High
Permanent Internal
pull-down
VDDIO
Reset State:
- SWJ-DP Mode
- Internal pull-up disabled
- Schmitt Trigger enabled
8
SAM4S Series [Preliminary]
11100BS–ATARM–31-Jul-12
ATMEL [ ATMEL CORPORATION ]
