LPC55S6 USB1 clock

[qingyunliu]

there are two questions about USB1 usage.

1. Is there method to force USB1 to run in full speed mode?

2. how to configure USB1 clock source as PLL or FRO, I didn't see register like USB0CLKSEL that can choose clock source. 

The SDK demo seem like USB1 can not choose clock source?

thanks.

[ZhangJennie]

Hi qingyunliu 

USB1 is HS USB device. It can't work in FS mode. But USB1 is compatible with FS USB device.

I don't know what clock source you want to change for USB1? USB1 is high speed device, we recommend external clock+ PLL to have a accurate frequency. 

Have a nice day,

Jun Zhang