SAM4SD16B datasheet(41/67 Pages) ATMEL

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11100BS–ATARM–31-Jul-12

SAM4S Series [Preliminary]

10.1

System Controller and Peripheral Mapping

Refer to Figure 8-1, "SAM4S Product Mapping".

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

10.2

Power-on-Reset, Brownout and Supply Monitor

The SAM4S embeds three features to monitor, warn and/or reset the chip:

• Power-on-Reset on VDDIO

• Brownout Detector on VDDCORE

• Supply Monitor on VDDIO

10.2.1

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.

10.2.2

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.

10.2.3

Supply Monitor on VDDIO

The Supply Monitor monitors VDDIO. It is not active by default. It can be activated by software

and is fully programmable with 16 steps for the threshold (between 1.6V to 3.4V). It is controlled

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

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

Controller (SUPC)” and “Electrical Characteristics” sections of the datasheet.

10.3

Reset Controller

The Reset Controller is based on a Power-on-Reset cell, and a Supply Monitor on VDDCORE.

The Reset Controller is capable to return to the software the source of the last reset, either a

general reset, a wake-up reset, a software reset, a user reset or a watchdog reset.

The Reset Controller controls the internal resets of the system and the NRST pin input/output. It

is capable to shape a reset signal for the external devices, simplifying to a minimum connection

of a push-button on the NRST pin to implement a manual reset.

The configuration of the Reset Controller is saved as supplied on VDDIO.

10.4

Supply Controller (SUPC)

The Supply Controller controls the power supplies of each section of the processor and the

peripherals (via Voltage regulator control).

The Supply Controller has its own reset circuitry and is clocked by the 32 kHz Slow clock

generator.

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