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16f84 rs232 on pin_a4

 
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steve c



Joined: 01 Apr 2005
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16f84 rs232 on pin_a4
PostPosted: Fri Apr 01, 2005 5:26 am     Reply with quote
I am receiving rs232 data from a GPS module (no level shifting required) perfectly OK on pin a3. When I change the code to receive on pin a4 I dont get any data. Any ideas?
Ttelmah
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PostPosted: Fri Apr 01, 2005 5:51 am     Reply with quote
Note that RA4, has a Schmitt triger type input buffer. Hence a signal driving it, has to reach 4.25v, for a 'high', as against only 2.4 volts on the other inputs (assuming you are running on a 5v supply). A pull up resistor, may make it work.

Best Wishes
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