原文:When initiating an erase sequence from the microcontroller itself, a block
of 64 bytes of program memory is erased.
我認為這是分詞構句，且省略前的句子為:
When a block of 64 bytes of program of memory initiate an erase sqeuence from
the microcontroller itself, a block of 64 bytes of program memory is erased.
想請問大家是不是醬子?(確定一下)

我認爲其實原文已經是原本形態了，因為副詞後動詞因為是加ing 變成主詞。

前面那句主詞是省略you, 因為block不會自己initiate erase指令，人才會，正常分詞是要主詞一致，但是很多native speaker都不會照這個規則寫datasheet很常見