Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

23

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

System I/O lines are pins used by oscillators, test mode, reset and JTAG to name but a few. Described below in

 are the SAM4E system I/O lines shared with PIO lines.

These pins are software configurable as general purpose I/O or system pins. At start-up, the default function of
these pins is always used.

Notes:

1. If PB12 is used as PIO input in user applications, a low level must be ensured at startup to prevent Flash erase before the 

user application sets PB12 into PIO mode, 

2. In the product Datasheet Refer to: “Slow Clock Generator” of the “Supply Controller” section.

3. In the product Datasheet Refer to: “3 to 20 MHz Crystal Oscillator” information in the “PMC” section.

12

ERASE

PB12

Low Level at start-up

In Matrix User Interface Registers

(Refer to the System I/O 

Configuration Register in the “Bus 

Matrix” section of this datasheet.)

7

TCK/SWCLK

PB7

-

6

TMS/SWDIO

PB6

-

5

TDO/TRACESWO

PB5

-

4

TDI

PB4

-

-

PA7

 XIN32

-

See footnote 

 below

-

PA8

 XOUT32

-

-

PB9

 XIN

-

See footnote 

 below

-

PB8

 XOUT

-