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Using the STK526
2.4
2.4.1
2.4.2
2.5
2.5.1
AT90USB82/162 AVR Microcontroller
Main Clock XTAL
To use the USB interface of the AT90USBxxx, the clock source should always be a
crystal or external clock oscillator (the internal 8MHz RC oscillator is not accurate
enough to comply with the USB specification). Only the following crystal frequency
allows proper USB operations: 8MHz and 16MHz. The STK526 comes with a default
8MHz crystal oscillator.
If STK526 is connected to an STK500 and the jumpers “STKX1” and “STKX2” are set,
the STK526 microcontroller operates with the “STK500 Osc” frequency parameter. The
STK500 clock prevails over the STK526 crystal.
Figure 2-8 . STKX1 and STKX2 jumpers on STK526
Analog Power Supply
AVCC AVCC is tied to VCC by hardware.
Serial Links
USB
The STK526 is supplied with a standard USB type-B receptacle (identifying the board as
a Device only) that aims to receive a B-plug
Figure 2-9 . USB type-B receptacle
STK526 rev. B Hardware User Guide
2-11
7709B–AVR–07/08
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