ATMEGA16U2 datasheet(48/314 Pages) ATMEL

No. de pieza	ATmega16U2

Descripción Electrónicos	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

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Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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48

7799B–AVR–07/09

ATmega8U2/16U2/32U2

Figure 10-1. Reset Logic

10.2.1

Power-on Reset

A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level

is defined in “System and Reset Characteristics” on page 267. The POR is activated whenever

V

CC is below the detection level. The POR circuit can be used to trigger the start-up Reset, as

well as to detect a failure in supply voltage.

A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the

Power-on Reset threshold voltage invokes the delay counter, which determines how long the

device is kept in RESET after V

CC rise. The RESET signal is activated again, without any delay,

when V

CC decreases below the detection level.

Figure 10-2. MCU Start-up, RESET Tied to V

CC

MCU Status

Register (MCUSR)

Brown-out

Reset Circuit

BODLEVEL [2..0]

Delay Counters

CKSEL[3:0]

CK

TIMEOUT

DATA BUS

Clock

Generator

SPIKE

FILTER

Pull-up Resistor

USB Device

Reset Detection

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

V

RESET

TIME-OUT

INTERNAL

RESET

t

TOUT

V

POT

V

RST

CC

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ATmega16U2 Datasheet(PDF) 48 Page - ATMEL Corporation

ATmega16U2 Datasheet(HTML) 48 Page - ATMEL Corporation

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