Hardware Description
AVR STK500 User Guide 3-27
1925C–AVR–3/03
3.11.2 PROGRAM Push
Button
Future versions of AVR Studio may upgrade the master microcontroller on STK500.
AVR Studio will then detect old software versions of STK500 and update the Flash pro-
gram memory of the master microcontroller. To do this, the user is required to push the
PROGRAM button when powering on STK500. AVR Studio issues instructions on how
to perform the upgrade during the upgrade process.
3.11.3 Main Power LED The red power LED is directly connected to the STK500 main power supply. The power
LED is always lit when power is applied to STK500.
3.11.4 Target Power LED The target power LED is connected to VCC lines (VTG) on the target AVR devices in the
sockets. The target power LED is lit when power is applied to the target AVR device.
3.11.5 Status LED The PROGRAM LED is a 3-color LED. During programming, the LED is yellow. When
the target AVR device is successfully programmed, the LED will turn green. If program-
ming fails, the LED will turn red to indicate that programming failed. When programming
fails, check the troubleshooting guide in Section 7 on page 7-1. During start-up, the sta-
tus LED will shift from red, through yellow, to green to indicate that the master
microcontroller is ready.
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