Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

11186A–ATARM–29-Nov-12

SAM9N12/CN11-EK has three mechanical push buttons for system application (PB1 to PB3) and one for 
free use (PB4).

Access to the RomBoot: 

1.

Press simultaneously the PBs OE-CS and NRST 

2.

Release the PB NRST

3.

Then release PB OE-CS

The program boots to the ROM code whatever the contents of the NAND Flash or serial DataFlash. 
Please refer to SAM9N12/CN11 datasheet boot strategy for details.

Figure 4-24.  PB1

The NRST pin is bidirectional. It is handled by the on-chip reset controller and can be driven low to pro-
vide a reset signal to the external components, or be asserted low externally to reset the microcontroller. 
It will reset the core and the peripherals except for the backup region.

Figure 4-25.  Push Button

 

PB3

NR ST

PB2

1

4

2

3

PB3

1

4

2

3

PB4

1

4

2

3

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