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Using the AT90USBKey
2.3
Reset
Although the AT90USB has its on-chip RESET circuitry (c.f. AT90USB Datasheet,
section “System Control and Reset), the AVRUSBKey provides to the AT90USB a
RESET signal witch can come from two different sources:
Figure 2-4 . Reset Implementation
VCC
R6
47k
C8
220nF
RESET
RST
2.3.1
2.3.2
2.3.3
Power-on RESET
RESET Push Button
Main Clock XTAL
The on-board RC network acts as power-on RESET.
By pressing the RESET push button on the AVRUSBKey, a warm RESET of the
AT90USB is performed.
To use the USB interface of the AT90USB, the clock source should always be a crystal
or external clock oscillator (the internal 8MHz RC oscillator can not be used to operate
with the USB interface). Only the following crystal frequency allows proper USB
operations: 2MHz, 4MHz, 6MHz, 8MHz, 12MHz, 16MHz. The AT90USBKey comes with
a default 8MHz crystal oscillator.
2-8
7627A–AVR–04/06
AT90USBKey Hardware User Guide
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