Rainbow-electronics ATmega3290P_V Uživatelský manuál stáhnout pdf (Strana 42)

100

101

ATmega329/3290/649/6490

2552H–AVR–11/06

Figure 16. MCU Start-up, RESET Tied to V

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 ATmega329/3290/649/6490 has an On-chip Brown-out Detection (BOD) circuit for mon-

itoring the V

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-

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

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