pub type ExtdataW<'a, REG> = FieldWriterSafe<'a, REG, 2, Extdata>;
Field EXTDATA writer - Extended data
EXTDATA
struct ExtdataW<'a, REG> { /* private fields */ }
external memory outputs data every BFCLK cycle
external memory outputs data every two BFCLK cycles
external memory outputs data every four BFCLK cycles
external memory outputs data every eight BFCLK cycles