Registered on :
11-14-2009
Messages : 1
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hello.
Now, we are designing a testing instrument for worksite which can transimit data to PC with USB.
In the end of the project, wo found the USB communication is very unstable, so we has to defer the project again and again.
The instructions of the project and problem:
MCU: STR710FZ2
Osclillator: 4M(to MCLK and USB); MCLK=OCLK*20/2=40M; USBCLK=4*12/1=48M
Test Code：Virtual Com Port
Problem: Connecting with PC and openning the the COM Debug Aid, 2~3 hour later the USB will dead. Therefor, reconnecting the USB line, it will work well again. 
Can you help me ?
Thanks,
Best Regards.
| Attachments : |  source.rar | 0461A.PCBDOC | CPU_Php.SCH | |
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help!!!The Stability of USB communication
Posted 17-11-2008 at 04:37 
