Issue with SSC0 communication: interrupt data transmitted is set right away

Hello all,

I'm emulating a SPI interface with the Synchronous interface of the XC164CS32F.

Here is what I do:
#1. init SPI (direction, baudrate, frame format)
#2. init sensor (direction, cs low, high)
#3. accessing a register of the sensor

I'm using already this emulated SPI interface to control a DAC and a ADC, both are working fine but, I have noticed that the flag SSC0_TIC_IR set previously at 0, is set to 1 as soon as I have written in the transmit register. Which proves to be a problem as the microcontroller should be waiting until all the data are transmitted. I have written then a

for

, but I don't like that.
Example of what I'm seeing on oscilloscope:
First signal = chip select
Second signal = clock

----__-------------------
----_-_-_-_-_-_-_-_------

As you can see, the CS is set to 1 before the data are transmitted. Normally it should be blocked because of the flag Transmit Interrupt SSC0_TIC_IR.

Code for initialisation:

void spi_Init(void)
{
        // SPI 8Bit
        SSC0_CON = (0<<EN)|(1<<MS)|(0<<AREN)|(0<<BEN)|(0<<PEN)|(0<<REN)|(0<<TEN)|(0<<LB)|
                                (0<<PO)|(1<<PH)|(1<<HB)|(1<<BM3)|(1<<BM2)|(1<<BM1)|(1<<BM0);
        SSC0_CON_EN = 1;
        SSC0_BR = (F_CPU /(SPI_BAUDRATE * 2L) - 1);
        ALTSEL0P3_P8 = 1;
        ALTSEL0P3_P9 = 1;
        ALTSEL0P3_P13 = 1;

        DP3_P8 = 0;                             // MISO Input
        DP3_P9 = 1;                             // MOSI Output
        DP3_P13 = 1;                    // Clock Output

        P3_P8 = 0;
        P3_P9 = 1;
        P3_P13 = 1;
}

Routine to write something on SPI interface:

 void spi_Write(unsigned int uiData)
{
        SSC0_TIC_IR = 0;
        SSC0_RIC_IR = 0;
        SSC0_TB  = uiData;
        while(SSC0_TIC_IR == 0){__asm{nop;}};
}

Dummy code using write function:

void test(void) {
CS = 0;
spi_Write(ADDRESS_REG_X);
CS = 1;
}

------------------------------------------
A solution could be to implement a loop (with a for i.e.), but I think its definitely not elegant, and I would like not to depend on the speed of the SPI interface.
Anyone has an idea why the flag SSC0_TIC_IR is set right away to 1?!

Thanks !

Renaud