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Haven’t received registration validation E-mail? User Control Panel Log out. Forums Posts Latest Posts. Forum Themes Elegant Mobile. Essentials Only Full Version. There is not enough time to read the 16bit like this: I can’t take a 16 bit latch to buffer the values, cause my design is already produced Sorry for my english, i’m from Switzerland German langague Greets burnmeister. Increase the clock speed of the PIC I’m surprised by your statement: Another problem can occur if there is no synchronisation between the two devices.
In this case, you have to: I think you should be more concerned about the other more prominant delays like the ADC conversion and acquisition, time taken to perform calculations on the data or to display datqsheet Using a bit latch daasheet only add to your delay. Hi burnmeister, Can you give a few more details, why is the speed important, what sort of ADC etc. I can’t think of any way that you can reduce this below the 3 instructions that bws125 have got, but maybe with a bit moreinfo we may be able to suggest something.
BSS Datasheet PDF –
I’m using this 1. The AD is ratasheet continuously. Data is avaliable during the low period of DRDY e. When i’m looking for the high period of DRDY with some code like this: If you have same good ideas, please go on Thanks for the answers till now anyway!!
Each time you get the detection, why not perform a wait by using a fixed number of NOP instructions 4 so that you would end up just past the start of lo DRDY on the next AD cycle, then do your code below. I can’t be sure to catch the impuls cause it’s only during for ns. I think you have beat us.
Do you know the English word “stumped”?
I’m only a “Junior Member” here! Otherwise there are only 4 ‘ instruction cycles available. The fastest pin-sampling loop I can think of is: You dahasheet listed the fastest way to read bsx125 ports: In that case – and assuming you can solve the synchronization problem between DRDY and the ‘ instruction cycle – there are just enough instruction cycles to work.
According to the Data Sheet Section This is clearly unusable. This might be useful for solving the sync problem.
So I need only x2 Bytes to read in, but this has to pass very quick. It would be very glad, if anyone can help me to understand the following timing diagramm. There must be a conversion time too or am I bws125 Remember that if you use Pic16F7x families. I cant say datashwet else about ‘timings’ because there’s no detailed information here of the signal you have to make digital. I have looked at the AD Data Sheet.
I am not certain that timing diagram Figure 7b is correct for your application. Or perhaps a combination of Figure 7b and Figure 7a. My understanding of the diagrams is this: Depending on what you can control, I would suggest code like the following all timing statements assume Datasheeet will remain valid for nearly nSec, as mentioned above.
THX a lot for your detailed answer dchisholm!!!
One Thing I still don’t understand: Hi burnmeister Without personally knowing your ADC chip, my guess is that the output is held in tri-state until either or both of the RD and CS lines are pulled low.
I don’t know how this fits in with you required sample rate, but you have as long as you need to take a sample. I think all 3 of us are confused by the same question but from different viewpoints. Allow me to add my comments to the confusion. Perhaps the third set of comments will only triple the confusion – I hope it doesn’t cause the confusion to be cubed! That is a species I have never encountered in the wild. From the “General Description” section of the Data Sheet, “The analog input is continuously sampledeliminating the need for an external sample-and-hold.
PIC16F877 Read the 16Bit of PortB&D at same time
The modulator output is processed by a finite impulse response FIR digital filter. The on-chip filtering combined with a high oversampling ratio ratio reduces the external antialias requirements. From “Circuit Description” in the Data Sheet: Finally, the filter output data is sampled read out every 16 conversions i.
This architecture of oversample-then-decimate-in-the-data-domain seems to be fairly common. It was invented, as the Data Sheet says, to put us grey-haired analog filter designers out of work. If I understand the question from “burnmeister” correctly, it can be bsx125 as: The analog rise time of whatever limits the input bandwidth. This includes the rise time of the signal source photodiode array plus the rise time of any anti-aliasing network on the analog input.
For your 16 MHz clock, this bsx125 to almost 34 uSec!! I am not certain that I understand this correctly, but the Data Sheet doesn’t seem to have any other ways to interpret that specification. You should talk with an Analog Devices Application Engineer who is familiar with this part and get an official explanation of this spec.
If this is true, it is clearly unusable in your application. It might be datashewt to do an experiment in your development lab. Trigger datasheett microcontroller program off the square wave edge: You may miss the first value, but that’s OK – you’re looking for the impulse response over several dozen readings. When memory is full, have the microcontroller send the data over RS to a computer.
Look at the data and see how fast the samples rise to the final value. It should take only a few seconds to tell if the 33uSec rise time is correct or not. I hope the circuit will run next monday. Then datasheft can monitor the ad-results in a fast way and make some experiments like you said!
Writing an email to an analog devices engineer is also a good idea i will do next week! Again a big Thanks for your ideas and help!!!! I see there is an expert on the other line So I can catch both of the bytes high and low in a time of approx ns: Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Why bs125 my PIC32 run slower than expected? Guest Super Member Total Posts: Gixy Super Member Total Posts: St Louis Mo Status: Embedded Software and Hardware Development