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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny43U датащи(PDF) 50 Page - ATMEL Corporation |
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ATtiny43U датащи(HTML) 50 Page - ATMEL Corporation |
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50 / 182 page  50 8048B–AVR–03/09 ATtiny43U 9.4 External Reset An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer than the minimum pulse width (see Table 20-4 on page 158) 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 9-4. External Reset During Operation 9.5 Brown-out Detection ATtiny43U 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 selected by the BODLEVEL Fuses. 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 V BOT- = VBOT - VHYST/2. When the BOD is enabled, and V CC decreases to a value below the trigger level (VBOT- in Figure 9-5 on page 50), the Brown-out Reset is immediately activated. When V CC increases above the trigger level (V BOT+ in Figure 9-5 on page 50), 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 20-4 on page 158. Figure 9-5. Brown-out Reset During Operation CC VCC RESET TIME-OUT INTERNAL RESET VBOT- VBOT+ tTOUT |
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