3 ms·
If you're refererring to the Atmel UC256l3U, it's in the same area as other touchscreen components so it could be something to do with them, possibly providing
by dan1234 14y ago
If you're refererring to the Atmel UC256l3U, it's in the same area as other touchscreen components so it could be something to do with them, possibly providing some glue between them and the main processor.
- joezydeco 14y agoI would agree. The Atmel multitouch system seems to involve the other 4 chips in that zone, so this processor is probably working with the output and doing some of the work that a kernel driver would normally do (dejiiter, smoothing, track ID matching) before presenting it to the host.
- unwind 14y agoI would (also) agree. A quick look at the handy product page that iFixit linked to (http://www.atmel.com/devices/atuc256l3u.aspx http://www.atmel.com/devices/atuc256l3u.aspx) shows that the controller has "25 touch channels", as well as supporting Atmel's "QTouch Acquisition" in hardware. As microcontrollers go, it's pretty beefy and would have made a decent computer all by itself not too many years ago. It's a 32-bit CPU running at 50 MHz, sporting 256 KB of flash memory and 32 KB of SRAM. Granted, it's a bit low on memory for a general-purpose computer. Maybe 20 years ago, then. :) It sure has a lot of I/O and other nice peripherals, though.