Figure 9-5. Brown-out Reset During Operation
VBOT+
VCC
VBOT-
RESET
t
TOUT
TIME-OUT
INTERNAL
RESET
9.6
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period tTOUT. Refer to
page 52 for details on operation of the Watchdog Timer.
Figure 9-6. Watchdog Reset During Operation
CC
CK
9.7
USB Reset
When the USB macro is enabled and configured with the USB reset MCU feature enabled, and
if a valid USB Reset signalling is detected, the microcontroller is reset unless the USB macro
that remains enabled. This allows the device to stay attached to the bus during and after the
reset, while enhancing firmware reliability.
50
AT90USB82/162
7707D–AVR–07/08
ATMEL [ ATMEL ]
