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HELP with Output to Input port voltages (data buss) please!!!

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3BABY

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Hi Guys,

im having some major issues trying to connect a 18F8722 to a 18F4550 - the 4550 is on an EasyPIC6 and the 8722 is on a BIGPIC6, i have PortG of the 8722 connected to PortB of the 4550 via 8 separate wires, all ports are pulled down via 10k resistors and i have used a common ground for both boards.. the problem is im not getting the data across on the 4550.. when the wires are connected i have like 1.8 volts on the line at logic 1.. when i disconnect the 4550 end of the line i have around 4.96v at logic 1... whats going on? what am i doing wrong?

any help would be much appreciated.. ive been trying to fix this issue for hours! ive tried a different board, different ports, difference uC's and still have the same issue.. it had to be a earth problem no?


HELP :-(
 

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