ATmega128-16AU datasheet(53/386 Pages) ATMEL

Teilenummer	ATmega128-16AU

Bauteilbeschribung	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

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Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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53 / 386 page

53

2467S–AVR–07/09

ATmega128

Figure 25. External Reset During Operation

Brown-out Detection

ATmega128 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

CC level dur-

ing operation by comparing it to a fixed trigger level. The trigger level for the BOD can be

selected by the fuse BODLEVEL to be 2.7V (BODLEVEL unprogrammed), or 4.0V (BODLEVEL

programmed). The trigger level has a hysteresis to ensure spike free Brown-out Detection. The

hysteresis on the detection level should be interpreted as V

BOT+ = VBOT + VHYST/2 and VBOT- =

V

BOT - VHYST/2.

The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD is enabled

(BODEN programmed), and V

CC decreases to a value below the trigger level (VBOT- in Figure

26), the Brown-out Reset is immediately activated. When V

CC increases above the trigger level

(V

BOT+ in Figure 26), the delay counter starts the MCU after the time-out period tTOUT has

expired.

The BOD circuit will only detect a drop in V

CC if the voltage stays below the trigger level for lon-

ger than t

BOD given in Table 19.

Figure 26. Brown-out Reset During Operation

CC

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

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ATmega128-16AU Datenblatt(PDF) 53 Page - ATMEL Corporation

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Ähnliche Teilenummer - ATmega128-16AU

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