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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT90USB646 датащи(PDF) 60 Page - ATMEL Corporation |
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AT90USB646 датащи(HTML) 60 Page - ATMEL Corporation |
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60 / 434 page  60 7593A–AVR–02/06 AT90USB64/128 Figure 8-2. MCU Start-up, RESET Tied to V CC Figure 8-3. MCU Start-up, RESET Extended Externally 8.0.4 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 8-1) 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 8-4. External Reset During Operation 8.0.5 Brown-out Detection AT90USB64/128 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V CC level during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be 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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