AT91SAM datasheet(8/67 Pages) ATMEL

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11100BS–ATARM–31-Jul-12

SAM4S Series [Preliminary]

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

1.62V to 3.6V(4)

VDDOUT

Voltage Regulator Output

Power

1.2V Output

VDDPLL

Oscillator and PLL Power Supply

Power

1.08 V to 1.32V

VDDCORE

Power the core, the embedded memories

and the peripherals

Power

1.08V to 1.32V

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

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