Can anyone point me to a good 65(c)22 overview?
I’ve read the data sheet a few times, but it’s not really sinking in.

I can input/output on the peripheral ports without any issues, but I’m not clear on how the timers/interrupts/shift registers etc. All work. What does ‘one shot’ even mean?
Do I have to have an interrupt as the result of a time finishing, or can I just have a ‘wait’ function etc.etc.

A few examples would help, but there doesn’t seem to be much out there that has this sort of info.

Any (pointers) much appreciated
(Geddit? )

It's not a primer, but Rodnay Zaks' Advanced 6502 Programming has some 6522 content.
https://archive.org/details/Advanced_6502_Programming

Also perhaps see Chapter 22 of the Advanced User Guide for the BBC Micro:
https://stardot.org.uk/forums/viewtopic.php?t=17242

My feeling is that all the information is in the datasheet, but you might need to see the same thing explained in various ways.

(And yes, you can choose not to enable interrupts, and just check the appropriate status bit to see if a timer has passed zero.)

One-shot means the timer runs once and then sticks at zero, as opposed to reloading the start count and going around endlessly. (I'm assuming a count-down timer.)

I suggest you acquaint yourself with 65(c)22 datasheets from several different manufacturers. If there's any specific question on your mind, you may find that one manufacturer explains it more clearly than the others. (One of my own favorites is the Rockwell datasheet.)

-- Jeff

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Ben Eater’s latest video focuses on using the timer in the 6522, so that’s helped explain some more of the data sheet.
I can have a play with the timers now I have a better idea of how all the registers interact for timer useage.

For future reference, I'm guessing that's How do hardware timers work? which, oddly, isn't currently in his "Build a 65c02-based computer from scratch" playlist (although at time of writing, the most recent two videos are about interrupts.)