I am using MCP4131 with 7 - bit ( 0 - 127 ). Datasheet said that, it can work bit 7 and 8 bit and i definetly need to use it with 8 bit ( 0 - 255 ). Here is my code below;

    #include <SPI.h>
    byte address = 0x00;
    int CS= 10;
    void setup()
    {
    pinMode (CS, OUTPUT);
    SPI.begin();
    
    }
    void loop()
    {
    digitalPotWrite(50);
    }
    
    int digitalPotWrite(int value)
    {
    digitalWrite(CS, LOW);
    SPI.transfer(address);
    SPI.transfer(value);
    digitalWrite(CS, HIGH);
    }


This is 7 bit code, to make it 8 bit, What should i change in the code ? Or what i need to do ?

Thank You
Best Regards