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ATMEGA3250 Datasheet(PDF) 41 Page - ATMEL Corporation |
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ATMEGA3250 Datasheet(HTML) 41 Page - ATMEL Corporation |
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41 / 353 page  41 ATmega325/3250/645/6450 2570J–AVR–11/06 Figure 16. MCU Start-up, RESET Tied to V CC Figure 17. MCU Start-up, RESET Extended Externally External Reset An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the minimum pulse width (see Table 16) will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the Reset Threshold Voltage – V RST – on its positive edge, the delay counter starts the MCU after the Time-out period – t TOUT – has expired. Figure 18. External Reset During Operation Brown-out Detection ATmega325/3250/645/6450 has an On-chip Brown-out Detection (BOD) circuit for mon- itoring the V CC level during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hys- V RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST CC RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST VCC CC |
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