Rainbow Electronics ATmega163L - Manual (Page 24)

ATmega163(L)
24
Figure 25. MCU Start-up, RESET Tied to VCC.
Figure 26. 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 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
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST