Rainbow Electronics ATmega162V - Manual (Page 48)

48
ATmega162/V
2513E–AVR–09/03
Figure 22. MCU Start-up, RESET Tied to V
CC
.
Figure 23. 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 18) 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 24. External Reset During Operation
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
V
CC
CC