Using the STK525
STK525 Hardware User Guide
2-23
7608A–AVR–04/06
2.9
Debugging
2.9.1
Debugging with AVR JTAG ICE mkII
Every STK525 can be used for debugging with JTAG ICE MK II.
Connect the JTAG ICE mkII as shown in Figure 2-21, for debugging help, please refer to
AVR Studio® Help information.
When using JTAG ICE MK II for debugging, and as AT90USBxxx parts are factory
configured with the higher security level set, a chip erase operation will be performed on
the part before debugging. Thus the on-chip flash bootloader will be erased. It can be
restored after the debug session using the bootloader hex file available from ATMEL
website.
2.10
Test Points
There are 8 test points implemented, these test points are referred in the full schematics
section.
Config.
Pads
Reference
Related Signals
Function
T1
D+
USB D+ data line
T2
D-
USB D- data line
T3
Aref
Analog reference
T4
Mic
Microphone preamplifier output
T5
3.3V
3.3V internal power supply
T6
5V
5V internal power supply
T7
Gnd
Ground
T8
Vbus
USB Vbus power supply
