Module RW

Constants

• PRE_PERIPH_CLK_SEL_0
  derive clock from PLL2
• PRE_PERIPH_CLK_SEL_1
  derive clock from PLL3 PFD3
• PRE_PERIPH_CLK_SEL_2
  derive clock from PLL2 PFD3
• PRE_PERIPH_CLK_SEL_3
  derive clock from PLL6