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ATMEGA8L-8AI Datasheet(PDF) 38 Page - ATMEL Corporation |
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ATMEGA8L-8AI Datasheet(HTML) 38 Page - ATMEL Corporation |
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38 / 303 page  38 ATmega8(L) 2486M–AVR–12/03 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 ATmega8 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 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- = VBOT - 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 (V BOT- in Figure 18), the Brown-out Reset is immediately activated. When VCC increases above the trigger level (V BOT+ in Figure 18), 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 longer than t BOD given in Table 15. Figure 18. Brown-out Reset During Operation CC VCC RESET TIME-OUT INTERNAL RESET VBOT- VBOT+ tTOUT |
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