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That doesn't mean that there aren't any bugs in the the clock initialization, Arduino Core code, or the user code that could cause additional drift... Most users are unlikely to notice 400ppm drift, so such bugs could go unnoticed for a long time.

Hmm. Do you happen to have a highly accurate (better than 20ppm) 16MHz Clock source that you could set up with aa SAMD21 running Arduino Software? (or maybe even one of those more common (?) 10MHz clocks? Or a 32768Hz clock.)

Have you made measurements on more than one Arduino Zero?

Note that your "0.5s in 20m" number and your 1.000020 Hz number to not agree...

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You could also configure the chip to output either the 32kHz (crystal) clock or the 48MHz (HW derived) clock on some pin, and measure that cock frequency to see if it agrees with the accuracy of your SW derived clock.

That's a mistake when I was trying to measure the time offset between each PPS generated. I didn't use right way, so let's forget about it. Then I measured time duration from timer interrupt. That's exactly 1 second, whatever I use micros() or another timer to count time. So based on this, Arduino it's own clock is right, no code or whatever other stuff effect this.

I also test this again around 1 hour. I found onboard computer time clock actually follow arduino zero (time synchronized with chrony). After test 1:06:42 later, both time clock is basically the same, but drift from Internet 2.3s, about 574 ppm? For test at beginning, Zero clock and Internet clock are aligned to the same.

So I can confirm right now, the arduino zero clock is drift about 500 ppm in my setting. One reason maybe all the electronics are enclosed in a housing, which make the temperature high when test in the air.

Do you happen to have a highly accurate (better than 20ppm) 16MHz Clock source that you could set up with aa SAMD21 running Arduino Software? (or maybe even one of those more common (?) 10MHz clocks? Or a 32768Hz clock.)

Actually, what I am trying to do is synchronize all the clocks to one, which is Arduino Zero. if Zero clock is drift, it's ok since we don't reliable time sources underwater, and all the system, sensors are drift, so they still matched. The main reason I posted this at first beginning: I want to make sure this time drift is common, since I heard Zero probably only drift 1.5 second one day.

This XOSC32K clock source is then mulitplied up using a Digtial Frequency Locked Loop (DFLL48M), to provide the 48MHz main CPU clock. The issue is with the imprecise integer multiplication used to generate the 48MHz clock source, which introduces addtional errors.

In the early versions of the Arduino Zero core code the XOSC32K clock source was multiplied by 1464, increasing the error to 576us per second. Later versions increased the multipler to 1465, thereby reducing the error down to 106us per second.

There are a couple of ways to workaround this problem. One is to employ the SAMD21's on-chip 96MHz Fractional Digital Phase Locked Loop (FDPLL96M) generated from the XOSC32K reference clock source, which as its name suggests allows for accurate fractional frequency adjustments without introducing the integer multiplication error.

If that still isn't precise enough, then it's possible to switch the FDPLL96M's reference clock over to an external generic clock (GCLK) pin. This allows for a 32.768kHz reference clock to be supplied by an external temperature compensated precision RTC, such as the DS3231.

Im trying get the elapsed time of my program. Actually i thought I should use yclock() from time.h. But it stays zero in all phases of the program although I'm adding 10^5 numbers(there must be some CPU time consumed). I already searched this problem and it seems like, people running Linux are having this issue only. I'm running Ubuntu 12.04LTS.

clock does indeed return the CPU time used, but the granularity is in the order of 10Hz. So if your code doesn't take more than 100ms, you will get zero. And unless it's significantly longer than 100ms, you won't get a very accurate value, because it your error margin will be around 100ms.

Anytime a register's output drives the clock port of other registers, i.e. a ripple clock, then a create_generated_clock must be applied to the register. I'm not completely sure why, but assume that since a register will always change the frequency, just passing the base clock through is incorrect. In your case, probably something like:

Looks correct. LPM_COUNTER should be just a regular counter built with carry-chains. (Each output, if used as a clock, is a ripple clock, but they don't ripple into the next bits clock port, i.e. they're all driven by pll_clk)

If you speak/understand JP, CH, or VN, the game is fun to play, it's not the typical VN in terms of having a happy vibe, but instead, a more serious tone focusing on time travel, abuse, or a bad future. Why are titles like Vari Bari, Collar x Malice, Steam Prison, or Amnesia have a western release but not clock zero? I've heard it's exclusive in Japan as there is barely any gameplay done in English, nor a Japanese playthrough.

Note that the Pygame Zero clock only holds weak references to each callbackyou give it. It will not fire scheduled events if the objects and methods arenot referenced elsewhere. This can help prevent the clock keeping objectsalive and continuing to fire unexpectedly after they are otherwise dead.

Imagine, if you wil, a Guage that has a needle that points straight up, with a value of 0. To the left, you have negative voltage up to -5. To the right, positive voltage, also up to 5. The neutral position of this gauage is zero. Any deviation from 0, will be either a positive or negative number.

What would you like to be added: The neutral or zero point of a gauge is at the left of the panel. When I set the range from e.g. Min=-5 to Max = 5 then the display of negative values looks not nat...

Zero-delay buffers (ZDB) provide a synchronous copy (no propagation delay) of the input clock at the outputs, usually without frequency translation. The Renesas ZDBs are PLL-based devices that regenerate the input clock signal with fanout to drive multiple loads offering various signal levels, including LVPECL, LVDS, HCSL, CML, HSTL, SSTL, or LVCMOS. ZDBs are ideal for applications requiring synchronized clocking for FPGAs, CPUs, logic, and synchronous memory.

Most zero-delay buffers allow the delay through the device to be adjusted through an external feedback path. This allows precise control of the timing of the clock signals to the loads. Simple frequency translation is possible with a ZDB when a single divider is used for all outputs, including feedback output, to maintain clock synchronization.

The Renesas zero-delay buffer (ZDB) IC families are available with a wide range of options and features. Differential outputs such as LVPECL, LVDS, HCSL, CML, HSTL, SSTL, as well as selectable outputs, are supported for output frequencies up to 3.2GHz and single-ended LVCMOS outputs for frequencies up to 350MHz. In addition, Renesas' PLL portfolio has devices supporting supply voltages from 1.2V up to 3.3V and that are available in the commercial and industrial temperature ranges.

Using a Renesas PLL product has many benefits. Reducing the number of quartz crystals on a board improves reliability because crystals are highly susceptible to shock and vibration. Using a clock signal generator also reduces a customer's board cost and space, bill of materials (BOM) and inventory levels by replacing multiple crystals and oscillators with one device. They are ideal for use in a large variety of systems, from personal computers to consumer electronics or industrial systems, as well as high-performance networking and communications systems.

Brief overview of IDT's zero-delay buffers. Zero-delay buffers (ZDB) are ideal for applications requiring synchronized clocking for FPGAs, CPUs, logic and synchronous memory. Zero-delay buffers are PLL-based devices that regenerate the input clock signal with fanout to drive multiple loads. Most devices allow the delay through the device to be adjusted through an external feedback path. This allows precise control of the timing of the clock signals to the loads. Zero-delay buffers provide a synchronous copy of the input clock at the outputs, usually without frequency translation. Simple frequency translation is possible when a single divider is used for all outputs, including feedback output, to maintain clock synchronization.Presented by Vik Chaudhry, technical marketing manager at IDT. For more information about IDT's rich portfolio of clock IC timing solutions, visit www.idt.com/go/clocks.

We demonstrate a zero-dead-time operation of atomic clocks. This clock reduces sensitivity to local oscillator noise, integrating as nearly 1/ whereas a clock with dead time integrates as 1/1/2 under identical conditions. We contend that a similar scheme may be applied to improve the stability of optical clocks.

But this could be done automatically when connecting the Flipper Zero through USB to lab.flipper.net or using Bluetooth and the companion App, to keep the device clock synced with the current time and avoid OTP codes or GPS drift due to the internal clock missmatch the real current time from 1 or 2 minutes after some months.

The dcf option is more a way of abusing the nfc off tuned , also why it only works in very close proximity, If you would really want to play around with this , matching the 50kw German output is not the most efficient one to match if that is your target I would go for a smaller target at first like my bedroom clock that might trip having the flipper next to the antenna.

An integrated top-down design system is presented in this paper for synthesizing clock distribution networks for application to synchronous digital systems. The timing behavior of a synchronous digital circuit is obtained from the register transfer level description of the circuit, and used to determine a non-zero clock skew schedule which reduces the clock period as compared to zero skew-based approaches. Concurrently, the permissible range of clock skew for each local data path is calculated to determine the maximum allowed variation of the scheduled clock skew such that no synchronization failures occur. The choice of clock skew values considers several design objectives, such as minimizing the effects of process parameter variations, imposing a zero clock skew constraint among the input and output registers, and constraining the permissible range of each local data path to a minimum value. ff782bc1db