SPI + PLL

hi all,

i have reviewed the the datasheet of the 2812 DSP, regarding the PLL configuration, and SPI,

the question is, i have 30Mhz crystal, and PLL configured to make 150Mhz, now i want to use the SPI, in Slave mode, the equation is = LSPCLK/(SPIBRR+1) ,,,,,now i want to know the LSPCLK what is this value, its not cleared at all in the datasheet, how can i caculate it ,,,,,, specially with the PLL being 150Mhz,,,,

thanks in advance

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Hey:

I recommend you to download and read the clocking section of spru078.It would be helpful.

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Dear All,

thanks alot, i downloaded and i have read it too, what is confusing me, is
there is four clocks,
1- the source clock, which in my case 30Mhz
2-PLL clock after multiplying it in my case its 150Mhz
3- High Speed clock
4- Low clock for the SPI communication

im little confused, if i configure the LSPCLK ,,,,what will be the normal
clock of the program, i mean it will be still as 150Mhz, from the PLL, or it
will be affected,,,,,,,or the LSPCLK will only affect on the SPI,
communication,,,

another thing, if i wanted to connect it through UART, is it okay to connect
the DSP directly -without rs232- to another controller.......i mean the Tx
and Rx just connected together,,,,,,or it will be crossed,
thanks again, Greeting, have a wonderful Night/Day
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