pub type HPRE_W<'a, const O: u8> = FieldWriter<'a, u32, CFGR_SPEC, u8, HPRE_A, 4, O>;
Field HPRE writer - HCLK1 prescaler (CPU1, AHB1, AHB2, and SRAM1.)
HPRE
SYSCLK not divided
SYSCLK divided by 3
SYSCLK divided by 5
SYSCLK divided by 6
SYSCLK divided by 10
SYSCLK divided by 32
SYSCLK divided by 2
SYSCLK divided by 4
SYSCLK divided by 8
SYSCLK divided by 16
SYSCLK divided by 64
SYSCLK divided by 128
SYSCLK divided by 512