Ben Stockton is a freelance technology writer based in the United Kingdom. In a past life, Ben was a college lecturer in the UK, training teens and adults. Since leaving the classroom, Ben has taken his teaching experience and applied it to writing tech how-to guides and tutorials, specialising in Linux, Windows, and Android.
He has a degree in History and a postgraduate qualification in Computing. Read Ben's Full Bio. Your email address will not be published. We hate spam too, unsubscribe at any time. Table of Contents. Subscribe on YouTube! The Programming Specification document for each device, available on the device web page, will detail this information. Figure 4: Checking the signals at the pins of the PIC microcontroller using an oscilloscope.
Figure 5: Information related to VPP voltage level and rise time from the programming specification document. NOTE : The values shown in Figure 5 are taken from the programming specification for one particular device. It may be different depending on the device used. Always refer to the programming specification for the specific device being used. For the PGD and PGC pins, a visual check on the oscilloscope will confirm if both the pins are active, the voltage levels are close to the VDD voltage level and if the square waves are not too rounded.
Refer to Figure 7 for an example of what would be seen on a functioning setup. If needed, a closer examination of the voltage level and timings can be checked against the parameters in the programming specification.
Step 2 : If the signals on the programming pins show a problem, then the signals should be checked along the path from the PIC microcontroller to the programmer. For example, if there is no signal present on a pin, or if the signal present has an incorrect voltage level, this could indicate an issue.
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