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ATTINY2313-20PU Folha de dados(PDF) 38 Page - ATMEL Corporation |
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ATTINY2313-20PU Folha de dados(HTML) 38 Page - ATMEL Corporation |
38 / 231 page 38 ATtiny2313/V 2543I–AVR–04/06 Figure 16. 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 15) 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 17. External Reset During Operation Brown-out Detection ATtiny2313 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 VBOT- = VBOT - VHYST/2. RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST VCC CC Table 16. BODLEVEL Fuse Coding (1) BODLEVEL 2..0 Fuses Min VBOT Typ VBOT Max VBOT Units 111 BOD Disabled 110 1.8 V 101 2.7 100 4.3 |
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