C8051F060的SPI 数据传输问题 很棘手

void SPI_Init()
{
SFRPAGE = SPI0_PAGE;

SPI0CFG = 0x70;//工作在主方式，SCK在空闲时处于低电平，第一个边沿采样数据
SPI0CN = 0x01;//使能SPI
SPI0CKR = 0x6D;//时钟频率定为100K，此处由公式F=SYSCLK/2*(SPI0CKR+1)得到
}
void SPI_send(void)
{
SFRPAGE = SPI0_PAGE;

SPI0DAT = 0x00;
while(!SPIF);
SPIF=0;
SPI0DAT = num[0];
while(!SPIF);
SPIF=0;
SPI0DAT = num[1];
while(!SPIF);
SPIF=0;
SPI0DAT = num[2];
while(!SPIF);
SPIF=0;

}