EVBQE128 Freescale, EVBQE128 Datasheet - Page 33

• Manufacturer Part Number: EVBQE128
• Manufacturer: Freescale

Specifications of EVBQE128

• Lead Free Status / RoHS Status: Compliant

9 Troubleshooting
9.1 USB Driver Problems
If you connected the Evaluation Board to the PC before installing CodeWarrior, the Evaluation
Board’s USB drivers may not have been correctly installed on your system. Unplugging and
replugging the USB cable is of no use, since Windows has marked the devices as “disabled”.
As a consequence, the PC cannot communicate with the Evaluation Board.
To restore/upgrade the USB drivers (provided CodeWarrior has been installed), perform the
following steps under Windows XP:
1.
2.
3.
4.
5.
6.
7.
9.2 Communication Problems between the PC and the
1.
2.
9.3 Problems with RS-232 Communication
The Jumper J205 allows the user to control the state of the RS-232 transceiver: when the
position 1-2 (“ON”, default position) is selected, the RS-232 transceiver is enabled (with the
aid of an external pull-up), but the user has the option to turn the transceiver off (on) by driving
the PTG0 line of the microcontroller low (high).
When the position 2-3 (“OFF”) is selected, the RS-232 transceiver is powered off via
Connect the Evaluation Board to the PC.
Open the Control Panel (Start > Settings > Control Panel).
Open the “System” options.
Select the “Hardware” tab.
Click the “Device Manager” button.
Two “EVBQE128” devices will be shown with an exclamation mark next to it.
For each device, double click on it and, in the “General” tab, click the “Reinstall
Driver” button. Follow the on-screen instructions.
Make sure that the “BKGD” and “RESET” jumpers in the “USB” section are inserted.
Make sure that the microcontroller is powered:
Demo Board
Make sure that the “ON-OFF” switch in the “POWER SUPPLY” section selects the
“ON” position;
Make sure that the “POWER SEL” jumper in the “POWER” section selects the
appropriate power supply source.
Page 31