ATXMEGA8E5 datasheet(32/153 Pages) MICROCHIP

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Data Sheet Complete

DS40002059A-page 32

ATxmega32E5/16E5/8E5

13.4.2

Brownout Detection

The on-chip brownout detection (BOD) circuit monitors the VCC level during operation by comparing it to a fixed, program-

mable level that is selected by the BODLEVEL fuses. If disabled, BOD is forced on at the lowest level during chip erase and

when the PDI is enabled.

13.4.3

External Reset

The external reset circuit is connected to the external RESET pin. The external reset will trigger when the RESET pin is

driven below the RESET pin threshold voltage, VRST, for longer than the minimum pulse period, tEXT. The reset will be held

as long as the pin is kept low. The RESET pin includes an internal pull-up resistor.

13.4.4

Watchdog Reset

The watchdog timer (WDT) is a system function for monitoring correct program operation. If the WDT is not reset from the

software within a programmable timeout period, a watchdog reset will be given. The watchdog reset is active for one to two

clock cycles of the 2MHz internal oscillator. For more details, see “WDT – Watchdog Timer” on page 33.

13.4.5

Software Reset

The software reset makes it possible to issue a system reset from software by writing to the software reset bit in the reset

control register. The reset will be issued within two CPU clock cycles after writing the bit. It is not possible to execute any

instruction from when a software reset is requested until it is issued.

13.4.6

Program and Debug Interface Reset

The program and debug interface reset contains a separate reset source that is used to reset the device during external

programming and debugging. This reset source is accessible only from external debuggers and programmers.

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