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CC1101的GDO2引脚是什么功能?

Other Parts Discussed in Thread: CC1101

看数据手册没说这个引脚是怎么表示芯片的状态,从网上下载的例程直接就用MCU来判断这个引脚,

#pragma vector = PORT2_VECTOR 
__interrupt void P2_ISR(void)
{

if(P2IFG|0xDF == 0xFF)//P2.5为高电平进入中断函数
{
P2IFG&=~(0x0020); //清除中断标志位
CC1101_OK = 1;
}
}