birt code 39

birt code 39

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Fully 90 percent of the problems that I get called on to x have issues in one of these three areas These values can be checked quickly using a logic or oscilloscope probe Once this is done, I carry out a scan around the PIC MCU to look at all the input and output voltage levels It shouldn t be surprising that I record (document) what I observe on a sheet of paper for later comparison against the expected state Digital logic levels can be checked with a logic probe but not voltage levels When you rst work with your applications, you may want to check the signal pins with both a logic probe and an oscilloscope or a voltmeter until you get a good understanding of what to expect when probing these pins and which tool works best for you.

When checking a PIC microcontroller s external crystal or ceramic resonator oscillator, make sure that you probe both pins with a logic probe or oscilloscope to make sure that the capacitance of the probe doesn t inadvertently set the application running This will happen with the PIC MCU s OscIn pin but not with the OscOut pin because the extra capacitance of the probe will cause a current ow to the probe tip, which will change the voltage level of the input and cause the oscillator to start running The best way to avoid this problem is to use a very low impedance FET oscilloscope probe or to check both pins in the case that the probe time affected the operation of the oscillator When you have done this, compare your notes with what the expected values are.

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This is an important point because I can t tell you how often I ve thought I ve caught a problem only to discover that I miscounted the pins and was looking at the wrong one, and the one that I thought had a problem was in the correct state Any actual discrepancies you nd can be put in one of two buckets : the ones that are caused by an external device driving the pin to the invalid state and the ones cause by the application code driving the pin incorrectly To discover where the problem lies, an ohm meter check is used before and after isolating the input-output (I/O) pin from the circuit This is known as a oating the pin and can be checked by removing the PIC microcontroller and bending the pin out or breaking the connection from the pin to the circuit.

Personally, I prefer breaking the connection to bending the pin; the metal used in chip pins tends to be brittle and easily broken if it is bent back and forth even once If the circuit turns out to be okay, then you put the circuitry back together (ie, restore lines by soldering them together), look back at the application code, and try to gure out why the pin could be in an invalid state When you are looking around the circuit, it is very important to not make any assumptions about what you think the problem is I call the state of mind that you must be in.

solution naive This is the ability to see and document exactly what is in front of you and turning off the lter that everybody has that allows them to think that they have the solution to the problem when they see something that matches their preconceived expectations You might be thinking that more than 90 percent of the time when you see a discrepancy, you will be able to recognize it as either a symptom or a cause of the problem, but in my experience, the actual number is much closer to 25 percent By not looking around naively, you probably will miss the shorted pins, incorrect wiring, or incorrectly typed instructions (ie, addwf register, w instead of addwf register, f).

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