PIC18F1220 RA4 using PULSIN ?

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  1. - 28th June 2009, 03:39 #2
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    Default Input buffer

    Hi
    This problem have been up before in the forum. http://www.picbasic.co.uk/forum/showthread.php?t=11236 I bet the reason that RA4 does not work is because the Schmitt trigger buffer on that pin. The easy explanation is that your R/C receiver is a 3V device and you run your PIC on 5V. You can solve this in many different ways depending on what you feel like doing. The easiest is a pull up resistor on the RA4 input to boost the voltage. This will however feed a higher voltage into the R/C receiver and that might be a problem. Or you change the voltage to 3V.

    Where in the datasheet is this? Under DC Characteristics datasheet page 250 under 22.3

    By the way I think the datasheet for PORTA has a big misstake in it.
    Last edited by sinoteq; - 28th June 2009 at 03:44.
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