NUVOTON + NRF24L01 Software Development. (SPI Communication)

Hello Everyone,

I try to develop Nuvoton + NRF24L01 SPI communicate each other. And I don't understand why MISO bus has 0x0E after I send Write_Command 0x20?

void NRF24_AdressTX(uint8_t reg, uint8_t *dataa)
{
    SPI_send_byte(0x20 | reg);
    SPI_send_byte(dataa[0]);
    SPI_send_byte(dataa[1]);
    SPI_send_byte(dataa[2]);
    SPI_send_byte(dataa[3]);
    SPI_send_byte(dataa[4]);
}

void NRF24_Init()     //NRF24L01 CONFIGURATIONS
{
    nrf24_WriteReg(CONFIG, 0x02);
    nrf24_WriteReg(EN_AA, 0x00);
    nrf24_WriteReg(EN_RXADDR, 0x01);
    nrf24_WriteReg(SETUP_AW, 0x03);
    nrf24_WriteReg(SETUP_RETR, 0x00);
    nrf24_WriteReg(RF_CH, 0x00);
    nrf24_WriteReg(RF_SETUP, 0x0E);
    NRF24_AdressTX(TX_ADDR, TxAddr);
}

And I send these configurations to MOSI bus as you can see in the picture. Is it correct way?

while(1)
        {
            NRF24_Transmit(0x01);
            delayMS(500);
        }

After configurations datas, I send 0xA0(PAYLOAD) and 0x01(MY DATA). I still get 0x0E, Why MISO Bus return 0x0E every write command?

NOTE: This code works as only transmitter. Not Reciever.

Questions

1) Is it correct way to control NRF24L01? If I am not what is the correct way for it?

2) My SCK Delay is 15us HIGH 15us LOW, is it enough?

3) When I Triggered CE pins HIGH TO LOW, I started to write period and send 1 byte data as well, but Is CE Pin need to be HIGH to finished sending all data? Or CE trigger is okay as you can see at above the picture.