pub type PLLMUL_W<'a> = FieldWriter<'a, u32, CFGR_SPEC, u8, PLLMUL_A, 4, 18>;
Field PLLMUL writer - PLL Multiplication Factor
PLLMUL
PLL input clock x4
PLL input clock x5
PLL input clock x6
PLL input clock x7
PLL input clock x8
PLL input clock x9
PLL input clock x6.5