1. This forum section is a read-only archive which contains old newsgroup posts. If you wish to post a query, please do so in one of our main forum sections (here). This way you will get a faster, better response from the members on Motherboard Point.

AT91RM9200 - PLL's - Main CLK

Discussion in 'Embedded' started by Pelos @ Home, Aug 18, 2006.

  1. Pelos @ Home

    Pelos @ Home Guest

    I'm going to fire-up my RM9200 board.
    I see that CPU is sending letter (but not XModem "CCCCC") on DBG-UART.
    The problem is that CPU is doing it to fast - one bit of that char tooks
    about 4,56us - I'm thinking that something wrong is with PLL.
    Can somebody be so kind and measure for me the amplitude on 18,432MHz
    crystal pins and the voltage on PLL-RCA and PLL-RCB pins ?

    thanks a lot!
    Pelos @ Home, Aug 18, 2006
    1. Advertisements

  2. Pelos @ Home

    Stef Guest

    In comp.arch.embedded,
    Sorry no time to measure it now. But I also had problems getting the right
    xmodem char. Which was usually solved by pressing reset again. This chip
    really needs a long power-up reset (> 1s). This is in the datasheet but
    I had missed it first time. When I changed my POR circuit, the problem
    was solved.
    Stef, Aug 19, 2006
    1. Advertisements

  3. Pelos @ Home

    Pelos @ Home Guest

    Hi Stef,
    Thanks for your suggestion. I will check it :)
    Pelos @ Home, Aug 19, 2006
  4. Pelos @ Home

    Pelos @ Home Guest

    Hi Stef,
    Thanks a lot !
    It works fine :)
    Now I'm trying to flash my SPI DataFlash.

    Best regards,
    Pelos @ Home, Aug 21, 2006
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.