Using the STK525
2-10
STK525 Hardware User Guide
7608A–AVR–04/06
2.2.4
“POWER-ON“ LED
The POWER-ON LED is always lit when power is applied to STK525 regardless of
power supply source and the regulation.
Figure 2-5 . “VCC-ON” LED
2.3
RESET
Although the AT90USBxxx has its on-chip RESET circuitry (c.f. AT90USBxxx
Datasheet, section “System Control and Reset), the STK525 provides the AT90USBxxx
a RESET signal which can come from 3 different sources:
2.3.1
Power-on RESET
The on-board RC network acts as power-on RESET.
2.3.2
RESET Push Button
By pressing the RESET push button on the STK525, a warm RESET of the
AT90USBxxx is performed.
Figure 2-6 . RESET Push Button (RST) Implementation
