搞定了,
上ATMEL的FAQ看了一下,找到下面一段:
at Reset, execution in Bootloader, you need to Held the /ISP to GND through a pull-down resistor (2.2kohm) at the falling reset.
This flow is described page 7 of the following document :
http://www.atmel.com/dyn/resources/prod_documents/doc4254.pdf
If you have still problems, could you execute the following sequence :
- first set the ISP condition
- Reset the device
- Connect the USB of your board (with AT89C51SND1C in ISP mode) to the
PC.
- You should observe wizard instructions displayed on your PC due to the detection of a USB component.
Follow the instructions as following :
When the device enumerates for ISP, Windows opens a "New Device
Detected" wizard.
You must, then, choose the driver install in a "specific location".Then
Windows prompts you for the location of the driver.The path which must
be written is : "C:Program FilesATMELFLIP 2.4.Xusb" folder of FLIP
which contains the INF file and the driver.
If you have still problems :
Open the device manager
- Connect the USB board (with AT89C51SND1C in ISP mode) to the PC.
- Could you observe the USB device that just popped up (normally Jungo)
- If not Jungo, select it and uninstall it. This will clean the windows
registries.
- unplug the device from the PC.
- In the directory : WINNTinf (for Windows 2000) or WINDOWSinf (for
Windows XP) search all files containing the following string :
- 89C51SND1
- 89c5132
- and delete them.
then test again as described at the beginning of this message.
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