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