Pic18f252,dacmax518 And I2c?

[mister_e]

Another version to try

    '   Hardware setting
    '   ================
        '
        '
        SDA var PORTC.4 
        SCL var PORTC.3
 
    '   Variable definition
    '   ===================
        '
        '
        Loop VAR Byte

    '   Constant definition
    '   ===================
        '
        '
        DACAddressByte con %01011000 ' DAC Address byte
        DACCommandByte con 0         ' DAC command byte

    '   Main Loop
    '   =========
        ' this loop will generate simple ramp-up and 
        ' ramp-down on the DAC output
        ' 
        '
start: 
 
    For Loop = 0 To 255
        I2CWRITE sda,scl,DACAddressByte,DACCommandByte,[Loop]
        Pause 10
        Next

    For Loop = 255 To 0 Step -1
        I2CWRITE sda, scl,DACAddressByte,DACCommandByte,[Loop]
        pause 10
        Next
    
    GoTo start