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:
- Core running at 60 MHz
- UART running at 115200 bps / 57600 bps / 38400 bps / 19200 bps /
- USB connectivity
Or are USART and USB connectivity mutyally exclusive???
Regards,
JaaC