Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 46)

100

101

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Figure 11-5. Brown-out Reset During Operation

11.2.4 Watchdog Reset

When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On

the falling edge of this pulse, the delay timer starts counting the Time-out period t

TOUT

. Refer to

page 47 for details on operation of the Watchdog Timer.

Figure 11-6. Watchdog Reset During Operation

11.3 Internal Voltage Reference

ATmega16M1/32M1/64M1 features an internal bandgap reference. This reference is used for

Brown-out DetectionDetection, and it can be used as an input to the Analog Comparators or the

ADC. The V

REF

2.56V reference to the ADC, DAC or Analog Comparators is generated from the

internal bandgap reference.

11.3.1 Voltage Reference Enable Signals and Start-up Time

The voltage reference has a start-up time that may influence the way it should be used. The

start-up time is given in “System and Reset Characteristics” on page 313. To save power, the

reference is not always turned on. The reference is on during the following situations:

RESET

TIME-OUT

INTERNAL

RESET

BOT-

BOT+

TOUT

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 46

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