AT91SAM7S256-128-64-321 USB and USART usage (clocking)

Hi,

I want to know if it is possible to use at the same time the USB and
UART peripheral on the AT91SAM7S256-128-64-321, with zero error on the
UART part.

The clocking scheme is what concerns me. As far as I understand you
have the main clock MCK from an external crystal (or clock signal). Is
MCK derived directly, I mean, does MCK have the same frequency as the
external crystal? The UART peripheral takes its input from either MCK
or MCK/DIV. USB needs a couple of clocks: clock from the PLL at 48MHz
and MCK.

So, what are the recommendded values of external clock and external PLL
filter if one needs:

1. Core running at 60 MHz
2. UART running at 115200 bps / 57600 bps / 38400 bps / 19200 bps /
9600 bps (possibility of using any of them)
3. USB connectivity

Or are USART and USB connectivity mutyally exclusive???

Regards,

JaaC

.

Relevant Pages

  • Re: AT91SAM7S256-128-64-321 USB and USART usage (clocking)
    ... have the main clock MCK from an external crystal. ... MCK derived directly, I mean, does MCK have the same frequency as the ... USB needs a couple of clocks: clock from the PLL at 48MHz ... what are the recommendded values of external clock and external PLL ...
    (comp.arch.embedded)
  • AT91SAM7S256-128-64-321 USB and USART usage (clocking)
    ... have the main clock MCK from an external crystal. ... MCK derived directly, I mean, does MCK have the same frequency as the ... USB needs a couple of clocks: clock from the PLL at 48MHz ... Or are USART and USB connectivity mutyally exclusive??? ...
    (comp.arch.embedded)
  • Re: AT91SAM7S256-128-64-321 USB and USART usage (clocking)
    ... UART peripheral on the AT91SAM7S256-128-64-321, ... have the main clock MCK from an external crystal. ... MCK derived directly, I mean, does MCK have the same frequency as the ... USB needs a couple of clocks: clock from the PLL at 48MHz ...
    (comp.arch.embedded)
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  • Re: Atmel ARM AT91SAM7S256 USB Question
    ... we are considering an ARM with a USB interface (Atmel ... Do any have utilities for configuring peripherals? ... "The UDP peripheral requires two clocks: one peripheral clock used by the MCK domain and a 48 MHz clock used by the 12 MHz domain." ...
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