I2CWRITE not writing anything on PIC18F45K80

[Ioannis]

I think you are missing the control before the address of the I2C commands.

Also DEFINE I2C_SLOW 1 is NOT needed.

try this

Cont = %01000000

I2CWRITE SDA,SCL,Cont,[%11111111]
PAUSE 500
I2CWRITE SDA,SCL,Cont,[%00000000]
pause 500


Ioannis

[CuriousOne]

And where to put address?
I have several PCFs....

[Ioannis]

OK, in the cont constant will be the address. What chip do you have? Is it the "A" type?

The "A" type needs cont=%0111AAA0

The plain PCF8574 needs cont=%01000AAA0

where AAA is the address bits.

Ioannis