//  Example of use:
//  In the main unit, put code here
//  ...

uses  PCF8574 ;      
//  ...

var 
    // Software I2C connections (examle), see  more details in the Soft I2C library help
    Soft_I2C_Scl_Output   : sbit at PORTB1_bit;
    Soft_I2C_Sda_Output   : sbit at PORTB0_bit;
    Soft_I2C_Scl_Input    : sbit at PINB1_bit;
    Soft_I2C_Sda_Input    : sbit at PINB0_bit;
    Soft_I2C_Scl_Direction: sbit at DDB1_bit;
    Soft_I2C_Sda_Direction: sbit at DDB0_bit;

 begin
//    ...

    PCF8574_Init(0x38, True); // Set address without R/W bit, Inverted flag set is TRUE
//    ...

    while True do
    begin
//    ...
    
        PCF8574_SwON(B1); // Setting pin P1 to low  level (if set flag Inverted)
    end; 

end.