原文:The 12-bit literal ‘k’ is loaded into the File Select Register pointed
to by ‘f’.
问题:pointed to by 'f'。
这边应该是File Select Register which is pointed to by 'f'省略which is。
想请问可以这样用吗?两个prep.放在一起?

'f' points to the File Select Register(被动)-> the File Select Register is pointed to by 'f'to 和 by 是分开看的，没问题

谢谢。