SAMG55 [SUMMARY DATASHEET]
Atmel-11289ES-ATARM-SAM-G55G-SAM-G55J-Summary-Datasheet_25-May-16
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3. Signal Description
Table 3-1 gives details on the signal names classified by peripheral.
Table 3-1. Signal Description List
Signal Name Function Type
Active
Level
Voltage
Reference Comments
Power Supplies
VDDIO
Peripheral I/O Lines, Voltage Regulator,
ADC Power Supply
Power – – 1.62V to 3.6V
VDDOUT Voltage Regulator Output Power – – 1.08V to 1.32V
VDDCORE Core Chip Power Supply Power – –
Connected externally to
VDDOUT or V
DDCOREXT100
or
V
DDCOREXT120
VDDUSB USB Power Supply Power – –
Only available on 64-pin
package
GND Ground Ground – – –
Clocks, Oscillators and PLLs
XIN Main Oscillator Input Input – VDDIO
Reset state:
- PIO input
- Internal pull-up disabled
- Schmitt Trigger enabled
XOUT Main Oscillator Output Output – –
XIN32 Slow Clock Oscillator Input Input – VDDIO
XOUT32 Slow Clock Oscillator Output Output – –
PCK0–PCK2 Programmable Clock Output Output – –
Reset state:
- PIO input
- Internal pull-up enabled
- Schmitt Trigger enabled
ICE and JTAG
TCK Test Clock Input – VDDIO No pull-up resistor
TDI Test Data In Input – VDDIO No pull-up resistor
TDO Test Data Out Output – VDDIO –
TRACESWO Trace Asynchronous Data Out Output – VDDIO –
SWDIO Serial Wire Input/Output I/O – VDDIO –
SWCLK Serial Wire Clock Input – VDDIO –
TMS Test Mode Select Input – VDDIO No pull-up resistor
JTAGSEL JTAG Selection Input High VDDIO Pull-down resistor
Flash Memory
ERASE
Flash and NVM Configuration Bits Erase
Command
Input High VDDIO Pull-down (15 kΩ) resistor
Reset/Test
NRST Microcontroller Reset I/O Low VDDIO Pull-up resistor
TST Test Mode Select Input – VDDIO Pull-down resistor
