diff options
Diffstat (limited to 'cores/arduino')
| -rw-r--r-- | cores/arduino/USBCore.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp index 8bcf66c..decfd6b 100644 --- a/cores/arduino/USBCore.cpp +++ b/cores/arduino/USBCore.cpp @@ -638,7 +638,11 @@ void USBDevice_::attach() _usbConfiguration = 0; UHWCON = 0x01; // power internal reg USBCON = (1<<USBE)|(1<<FRZCLK); // clock frozen, usb enabled +#if F_CPU == 16000000UL PLLCSR = 0x12; // Need 16 MHz xtal +#elif F_CPU == 8000000UL + PLLCSR = 0x02; // Need 8 MHz xtal +#endif while (!(PLLCSR & (1<<PLOCK))) // wait for lock pll ; |