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ATmega128
Figure 25. External Reset During Operation
CC
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+ = V BOT + V HYST /2 and V BOT- =
V BOT - V HYST /2.
The BOD circuit can be enabled/disabled by the fuse BODEN. W hen the BOD is enabled
(BODEN programmed), and V CC decreases to a value below the trigger level (V BOT- in Figure
26 ), the Brown-out Reset is immediately activated. W hen V CC increases above the trigger level
(V BOT+ in Figure 26 ), the delay counter starts the MCU after the time-out period t TOUT 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
V CC
RESET
TIME-OUT
V BOT-
V BOT+
t TOUT
INTERNAL
RESET
52
2467X–AVR–06/11
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