Can I use a 10MHZ clock signal? I am using SH1 processor with 20MHZ clock signal. My timer outputs can generate a maximum of 10 MHZ. Or probably i can use a common clock with sh1 processor as you suggested. can anyone pls tell me exact usage of the PLL in the circuit. i've used anchor USB chip and all i needed was D+ and D- from the USB connector as input.