Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 44)

100

101

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Figure 11-1. Reset Logic

11.2.1 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 313. The POR is activated whenever

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

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

when V

decreases below the detection level.

Figure 11-2. MCU Start-up, RESET

Tied to V

MCU Status

Brown-out

Reset Circuit

BODLEVEL [2..0]

Delay Counters

CKSEL[3:0]

TIMEOUT

WDRF

BORF

EXTRF

PORF

DATA B U S

Clock

Generator

Spike

Filter

Pull-up Resistor

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

RESET

TIME-OUT

INTERNAL

RESET

TOU T

RST

CCRR

PORMIN

PORMAX

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 44

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