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Thanks Dave,
I really appreciate your time and patient. in I2c command where it asks about the address I thought it asks about chip's physical address, but now thank to you I can fully control this...

Ok I changed it to 4.7k R and correct the port direction.
could you please tell me what im doing wrong for initializing the chip? I know the default mode chip's port are all input and all the...

Hey Dave, thanks man
you were right i made that mistake and i looked over and i couldn't catch it, you are having good eyes (i fixed it now).
but still there is no success. even i copy you code...

Thanks Dave,

before i used to define 16f877a register like ( adcon = $82), so i thought it should be same to define mcp registers like (IODIRA = $00 to make my mcp port a as output), I got my...

Hey Dave,
Im trying to use 16f877a with macp23017, but I wasn't successful.
I define the mcp23017 register, but when I want to compile my program it gives me error.
I tried to use your program and...