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HI, I am using P89v51rd2 to control L293D. My code is running on Eval board but not on the circuit I designed (all ports are reset to High state and code is not running). I used P0.0-P0.3 for input, P2.0-P2.3 as output. only other connection is 11.0592MHz xtal with 33pF caps. Please let me know what to do Regards, FD
I used to have a logic probe, but I'm not sure it would help determine frequency, just that the pin was toggling.
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Then again I used to test 9V batteries with my tongue.