Rule 1: Correctly configure the brain before posting. On 21.04.2010 10:01, Harald Kipp wrote: > I discovered the following in nut/include/arch/arm/at91_pmc.h: > > #define PMC_CSS_PLLA_CLK 0x00000002 > #define PMC_CSS_PLLB_CLK 0x00000003 This is fully correct. Harald