December 1, 2022

Motemapembe

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To Turn An ATtiny817 Into A 150MHz Counter, First Throw Out The Spec Sheet

One generally reads a info sheet in a single of two approaches. The first is to choose every spec at facial area value, figuring that the engineers have taken every thing into account and introduced each number as the absolute limit that will protect against the Magic Smoke from escaping. The other way is to toss out the information sheet and just try out regardless of what you want, figuring that the engineers performed it as safely as feasible.

The latter situation appears to be to have been the drive driving pushing an ATtiny way, WAY beyond what the spec sheet says is feasible. In accordance to [SM6VFZ], the specs on the ATtiny817 display that the 12-little bit timer/counter D (TCD) should be limited to a measly 32 MHz highest frequency, above which one particular is meant to employ the counter’s inner prescaler. But by applying a 10-MHz precision frequency generator as an external clock, [SM6VFZ] located that inputs up to slightly higher than 151 MHz were being countable with 1-Hz precision. Previously mentioned that level, items started off to drift, but that is nevertheless rather fantastic functionality from one thing cobbled collectively on an eval board in a decidedly suboptimal way.

We’d consider this outcome could lead to some fascinating assignments, due to the fact the undocumented restrict for this timer puts it well inside range of a number of newbie radio allocations. Even if it does not establish practical, that’s Okay — just looking at how far issues can be pushed is cool way too. And it’s not like this is the initial time we have caught [SM6VFZ] persuading an ATtiny to do unusual points, possibly.