I do not really understand what you mean by "refreshed". If you press a key,
the keyboard sends a scan code to the PC (and sometimes on release too). It
also receives commands from the PC, like "turn on the NUM-LOCK LED". Other
than that, I think it just sits there.
Do you mean the clock rate of the data? I remember the bit period being ~40
microseconds. I found a fair amount of stuff with search engines using "ps2
keyboard protocol". I wrote some microcontroller software to talk to a PS/2
mouse, and used a keyboard for initial testing.
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