Datasheet

11011B–ATARM–21-Feb-12

SAM3N

8.1 System Controller and Peripheral Mapping

Please refer to Figure 7-1, "SAM3N4/2/1/0/00 Product Mapping" on page 27.

All the peripherals are in the bit band region and are mapped in the bit band alias region.

8.2 Power-on-Reset, Brownout and Supply Monitor

The SAM3N embeds three features to monitor, warn and/or reset the chip:

• Power-on-Reset on VDDIO

• Brownout Detector on VDDCORE

• Supply Monitor on VDDIO

8.2.1 Power-on-Reset

The Power-on-Reset monitors VDDIO. It is always activated and monitors voltage at start up but

also during power down. If VDDIO goes below the threshold voltage, the entire chip is reset. For

more information, refer to the “Electrical Characteristics” section of the datasheet.

8.2.2 Brownout Detector on VDDCORE

The Brownout Detector monitors VDDCORE. It is active by default. It can be deactivated by soft-

ware through the Supply Controller (SUPC_MR). It is especially recommended to disable it

during low-power modes such as wait or sleep modes.

If VDDCORE goes below the threshold voltage, the reset of the core is asserted. For more infor-

mation, refer to the Supply Controller (SUPC) and Electrical Characteristics sections of the

datasheet.

8.2.3 Supply Monitor on VDDIO

The Supply Monitor monitors VDDIO. It is inactive by default. It can be activated by software and

is fully programmable with 16 steps for the threshold (between 1.9V to 3.4V). It is controlled by

the Supply Controller (SUPC). A sample mode is possible. It allows to divide the supply monitor

power consumption by a factor of up to 2048. For more information, refer to the Supply COntrol-

ler and Electrical Characteristics sections of the datasheet.