One particular normally reads a knowledge sheet in 1 of two means. The first is to take every single spec at deal with value, figuring that the engineers have taken all the things into account and presented just about every amount as the complete limit that will stop the Magic Smoke from escaping. The other way is to throw out the info sheet and just check out no matter what you want, figuring that the engineers played it as safely as attainable.
The latter situation looks to have been the drive powering pushing an ATtiny way, WAY outside of what the spec sheet suggests is doable. According to [SM6VFZ], the specs on the ATtiny817 present that the 12-bit timer/counter D (TCD) must be confined to a measly 32 MHz optimum frequency, previously mentioned which just one is intended to employ the counter’s inner prescaler. But by applying a 10-MHz precision frequency generator as an external clock, [SM6VFZ] observed that inputs up to a bit higher than 151 MHz were countable with 1-Hz precision. Earlier mentioned that issue, factors started to drift, but which is nevertheless quite terrific efficiency from some thing cobbled collectively on an eval board in a decidedly suboptimal way.
We’d visualize this consequence could direct to some attention-grabbing jobs, due to the fact the undocumented restrict for this timer places it effectively inside of range of various beginner radio allocations. Even if it doesn’t establish practical, which is Ok — just seeing how considerably matters can be pushed is great also. And it’s not like this is the initially time we’ve caught [SM6VFZ] persuading an ATtiny to do unconventional things, possibly.