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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