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aialinux
Visitor II
August 15, 2006
Question

STR7 USB CLOCK!

  • August 15, 2006
  • 2 replies
  • 775 views
Posted on August 15, 2006 at 06:44

STR7 USB CLOCK!

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    2 replies

    A
    aialinuxAuthor
    Visitor II
    August 15, 2006
    Posted on August 15, 2006 at 05:47

    I am debuging USB Mouse demo using my str7 board. I want to use 48MHZ osc to

    USBCLK pin. But the usb demo can't work!

    How can I init the cpu using 48MHZ osc to USBCLK PIN?

    A
    anis23
    Visitor II
    August 15, 2006
    Posted on August 15, 2006 at 06:44

    Hi dom,

    Actually the Mouse demo included in the STR7 USB Developer Kit uses already an external 48Mhz to clock the USB IP (all demos are implemented in the STR7 Eval Board)... So it should works fine in your board... Maybe the problem is due to the main or APB clocks? Note that to avoid data overrun/underrun problems in the USB IP the APB clock frequency must be greater than 8 MHz...

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