I agree with Al, set port latches low before the tris register and make sure RBPU is disabled OPTION_REG.7 = 1Originally Posted by mikey11
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I agree with Al, set port latches low before the tris register and make sure RBPU is disabled OPTION_REG.7 = 1
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The following may correct any R-W-M mismatch condition, but it is a little risky to write to the output latch (even if not an output) when it maybe directly connected to +5V (through the SW):Would an initial read to the port, before the actual loop, do the same?Code:PortA = 0 PortB = 0
The RBPU should be disabled by default (unless PBP assigns it behind the scenes).
For these reasons I would have the port connected to +5V through a 10k resistor; and the switch would connect the port to GND (may be through 1k for protection).
The following post may give some ideas (not identical, but helps illustrate): http://www.picbasic.co.uk/forum/show...t=weak+pull-up
Last edited by languer; - 26th August 2009 at 09:00. Reason: update with link to post
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Forgot to say that should you do this:You would change your code to read, "if startbutton = 0".For these reasons I would have the port connected to +5V through a 10k resistor; and the switch would connect the port to GND (may be through 1k for protection).
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