MAINCLK = 18.432MHz PLLCLK(div=24,mul=125) = 96MHz MCLK(divisor 2) = 48MHz USB(divisor 2) = 48MHz MC_FWR(FWS) = 2 # 1 flash waitstate SPCK(SCBR=10) = 4.8MHz # 5MHz max clock RC632