Hi Friends,
I am using LPC2378 processor with 16 MHz crystal oscillator.I am trying to connect the USB CDC but the USB device not recognized by PC.
The same code using the 12 MHz oscillator is working.
Fcco value = 288 MHz Crystal oscillator value = 12MHz PLL 'M' value = 12 PLL 'N' value = 1 USBCLKCFG,USBSEL value = 6
Result : The USB CDC is detecting in PC
Fcco value = 288 MHz Crystal oscillator value = 16MHz PLL 'M' value = 9 PLL 'N' value = 1 USBCLKCFG,USBSEL value = 6
Result : The USB CDC is Not Recognized
I am using the Formula to calculate the M value is M = Fcco/2xcrystal oscillator vale
Please help me to solve this problem.
With Regards, Murthy.R