AT90S4414/8515
23
External Reset
An external reset is generated by a low level on the RESET
pin. Reset pulses longer than 50 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 26. External Reset During Operation
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of 1 XTAL cycle duration. On the falling edge of this
pulse, the delay timer starts counting the Time-out period t
TOUT
. Refer to page 38 for details on operation of the Watchdog.
Figure 27. Watchdog Reset During Operation
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