Atmel Evaluation-Board AT90USBKey AT90USBKey AT90USBKey-2 データシート
製品コード
AT90USBKey-2
AT90USBKey Hardware User Guide
3-15
7627A–AVR–04/06
Section 3
Troubleshooting Guide
Figure 3-1 . Troubleshooting Guide
Problem
Reason
Solution
The Green “VCC-ON”
LED is not on
LED is not on
No power supply
Verify the power supply source (check
battery charge or USB connection).
battery charge or USB connection).
AVRUSBKey does not
work
work
The AT90USB cannot be
programmed
programmed
The AVR JTAG ICE
probe is not
connected
probe is not
connected
The memory lock bits
are programmed
are programmed
Erase the memory before programming
with JTAG ICE.
with JTAG ICE.
The fuse bits are
wrongly programmed
wrongly programmed
Check the fuse bits with JTAG ICE
Can not connect to
USB bootloader
USB bootloader
Force bootloader execution with HWB
under reset.
under reset.
USB bootloader erased after a JTAG
debugging session: reprogram the USB
bootloader with JTAG.
debugging session: reprogram the USB
bootloader with JTAG.
AVR Studio does not
detect the AVR JTAG
ICE.
detect the AVR JTAG
ICE.
Serial/USB cable is
not connected, or
power is off
not connected, or
power is off
Connect serial cable to RS232 (STK500 -
AVR ISP) and check power connections
AVR ISP) and check power connections
Connect serial cable to USB (JATG ICE
MKII, AVR ISPmkIIl) and check power
connections
MKII, AVR ISPmkIIl) and check power
connections
PC COM port is in
use
use
Disable other programs that are using
PC COM port.
PC COM port.
Change PC COM port
AVR Studio does not
detect COM port.
detect COM port.
Disable COM port auto-detection in AVR
Studio file menu. Force COM port to
correct COM port
Studio file menu. Force COM port to
correct COM port