TLC5973 EasySet

Goodmorning to all, I'm trying to develop an application using TLC5973 LED driver with a small 8 bit microcontroller. I can't find any information about the EasyStep 1-wire comunication interface. I readed the datasheet many times but it didn't help me so much...

My code is this:

#define PULSE() oLED = 1; oLED = 0;
void writeZero(){
    PULSE();
    NOP();
    NOP();
    NOP();
    NOP();
    NOP();
    NOP();
    NOP();
    NOP();
}

void writeOne(){
    PULSE();
    NOP();
    PULSE();
    NOP();
    NOP();
    NOP();
    NOP();
    NOP();
}

void writeWord(unsigned short word){
    unsigned char i;
    for(i = 0; i < 12; i++){
        if(word & 0x0800)
            writeOne();
        else
            writeZero();
        word <<= 1;
    }
}

void setLed(unsigned short R, unsigned short G, unsigned short B){
    writeWord( 0x03AA);
    writeWord( R );
    writeWord( G );
    writeWord( B );
    waitGSLAT();
}

With the oscilloscope all timing is right (I get a tcycle of 2us, with the writeOne function the second pulse is under 50% of tcycle) but no result are given on the output led. The LED is ok and I changed 3 different TLC5973 to ensure that also the driver is ok... 

Someone has an idea of what is going wrong?

Regards

Alessio