“Is it correct to say that if there is cakkhuviññāṇaṃ then the rupa is registered in rūpakkhandha?”
The easiest way to remember is the following way.
In “Cakkhuñca paṭicca rūpe ca uppajjāti cakkhuviññāṇaṃ” cakkhu viññāṇa arises MEANS the “seeing event” was registered in the mind.
– For example, when you look up from the desk and see person X standing at the door.
– The registration of X’s figure in the mind is cakkhu viññāṇa.
– The picture of X (and whatever is in the background, i.e., all you see at that moment) gets added to rūpakkhandha. That is just one “snapshot” added.
– As you talk to X and keep watching him, you are adding MANY such “snapshots” to the rūpakkhandha. That is why it is called a “collection” or “khandha” of rupa.
“Memories are dhammā, correct? and that recalling memories is: manañca paṭicca dhamme ca uppajjāti manoviññāṇaṃ”
– Yes. That is correct.