Rainbow-electronics ATmega161L Manual do Utilizador descarregar pdf (Página 28)

ATmega161(L)

1228C–AVR–08/02

External Reset An External Reset is generated by a low level on the RESET pin. Reset pulses longer

than 500 ns 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 timer starts the MCU after the

Time-out period (t

TOUT

) has expired.

Figure 27. External Reset during Operation

Watchdog Reset When the Watchdog times out, it will generate a short reset pulse of 1 XTAL cycle dura-

tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period

TOUT

). Refer to page 58 for details on operation of the Watchdog.

Figure 28. Watchdog Reset during Operation

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Rainbow-electronics ATmega161L Manual do Utilizador Página 28